Fix spacing warnings in YAML files

What does this MR do and why?

As part of working on !136388 (merged) I had trouble spotting the YAML file that had an error, because we had so many files with warnings. Separately, I've created Fix spacing warnings in deprecation files (!136505 - merged) for the files owned by the Technical Writing team, because they can be merged with less oversight.

This MR adds whitespace changes to:

• .gitlab/ci/database.gitlab-ci.yml
• .gitlab/ci/frontend.gitlab-ci.yml
• .gitlab/ci/global.gitlab-ci.yml
• .gitlab/ci/rails.gitlab-ci.yml
• .gitlab/ci/review-apps/main.gitlab-ci.yml
• .gitlab/ci/rules.gitlab-ci.yml
• .gitlab/ci/templates/gem.gitlab-ci.yml
• .gitlab/ci/test-on-gdk/main.gitlab-ci.yml
• lib/gitlab/ci/templates/Cosign.gitlab-ci.yml

To see the job output and why I chose to act: https://gitlab.com/gitlab-org/gitlab/-/jobs/5494639235 or expand this section:

Find the one line that's an error

$ yamllint -d "{extends: default, rules: {line-length: disable, document-start: disable}}" $LINT_PATHS
.gitlab/ci/rules.gitlab-ci.yml
  934:47    warning  too few spaces before comment  (comments)
  1592:5    warning  comment not indented like content  (comments-indentation)
  1631:34   warning  too few spaces before comment  (comments)
  1687:47   warning  too few spaces before comment  (comments)
.gitlab/ci/frontend.gitlab-ci.yml
  70:67     warning  too few spaces before comment  (comments)
.gitlab/ci/rails.gitlab-ci.yml
  64:24     warning  too few spaces before comment  (comments)
  78:24     warning  too few spaces before comment  (comments)
  351:23    warning  too few spaces before comment  (comments)
  352:34    warning  too few spaces before comment  (comments)
  360:25    warning  too few spaces before comment  (comments)
  366:35    warning  too few spaces before comment  (comments)
  368:33    warning  too few spaces before comment  (comments)
  370:44    warning  too few spaces before comment  (comments)
  382:34    warning  too few spaces before comment  (comments)
  395:46    warning  too few spaces before comment  (comments)
  397:44    warning  too few spaces before comment  (comments)
  399:55    warning  too few spaces before comment  (comments)
  411:36    warning  too few spaces before comment  (comments)
  412:43    warning  too few spaces before comment  (comments)
  419:38    warning  too few spaces before comment  (comments)
  426:44    warning  too few spaces before comment  (comments)
  428:51    warning  too few spaces before comment  (comments)
  430:46    warning  too few spaces before comment  (comments)
  437:36    warning  too few spaces before comment  (comments)
  439:47    warning  too few spaces before comment  (comments)
  441:31    warning  too few spaces before comment  (comments)
  443:37    warning  too few spaces before comment  (comments)
  445:38    warning  too few spaces before comment  (comments)
  447:33    warning  too few spaces before comment  (comments)
.gitlab/ci/database.gitlab-ci.yml
  75:17     warning  too few spaces before comment  (comments)
.gitlab/ci/global.gitlab-ci.yml
  39:16     warning  too few spaces before comment  (comments)
  49:16     warning  too few spaces before comment  (comments)
  232:27    warning  too few spaces before comment  (comments)
  502:24    warning  too few spaces before comment  (comments)
.gitlab/ci/templates/gem.gitlab-ci.yml
  21:11     warning  comment not indented like content  (comments-indentation)
.gitlab/ci/test-on-gdk/main.gitlab-ci.yml
  30:25     warning  too few spaces before comment  (comments)
.gitlab/ci/review-apps/main.gitlab-ci.yml
  48:40     warning  too few spaces before comment  (comments)
  51:43     warning  too few spaces before comment  (comments)
  101:40    warning  too few spaces before comment  (comments)
  103:43    warning  too few spaces before comment  (comments)
lib/gitlab/ci/templates/Cosign.gitlab-ci.yml
  15:24     warning  too few spaces before comment  (comments)
  17:24     warning  too few spaces before comment  (comments)
data/deprecations/16-0-deprecate-omnibus-grafana.yml
  22:10     warning  too few spaces before comment  (comments)
data/deprecations/16-1-windows-cmd-runner-shell-executor.yml
  5:30      warning  too few spaces before comment  (comments)
  8:17      warning  too few spaces before comment  (comments)
  9:67      warning  too few spaces before comment  (comments)
  13:37     warning  too few spaces before comment  (comments)
data/deprecations/16-4-ci_job_token_scope_enabled-attribute-deprecation.yml
  10:67     warning  too few spaces before comment  (comments)
data/deprecations/16-1-unified-approval-rules.yml
  27:91     warning  too few spaces before comment  (comments)
data/deprecations/16-6-lfs-integrity-check-feature-flag-deprecation.yml
  10:1      error    trailing spaces  (trailing-spaces)
data/deprecations/  16_3_runner-terminationgracepriodseconds.yml
  1:95      warning  too few spaces before comment  (comments)
  2:29      warning  too few spaces before comment  (comments)
  3:34      warning  too few spaces before comment  (comments)
  4:26      warning  too few spaces before comment  (comments)
  5:22      warning  too few spaces before comment  (comments)
  6:16      warning  too few spaces before comment  (comments)
  17:34     warning  too few spaces before comment  (comments)
  21:36     warning  too few spaces before comment  (comments)
  22:81     warning  too few spaces before comment  (comments)
data/deprecations/16_2-custom_sign_in_fields.yml
  1:77      warning  too few spaces before comment  (comments)
  2:34      warning  too few spaces before comment  (comments)
  3:35      warning  too few spaces before comment  (comments)
  4:29      warning  too few spaces before comment  (comments)
  5:30      warning  too few spaces before comment  (comments)
  6:25      warning  too few spaces before comment  (comments)
  7:25      warning  too few spaces before comment  (comments)
  8:17      warning  too few spaces before comment  (comments)
  9:75      warning  too few spaces before comment  (comments)
Cleaning up project directory and file based variables
00:01
ERROR: Job failed: exit code 1

Related

• Related to Deprecation notice for lfs_check feature flag (!136388 - merged) where I got frustrated
• Related to Fix spacing warnings in deprecation files (!136505 - merged) where I'm fixing the TW-related files

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