Feature Request: changes_exclude keyword request for excluding files in change detection in rules and only

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### Proposal

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/label ~group:: ~section:: ~Category:
/label ~"GitLab Free" ~"GitLab Premium" ~"GitLab Ultimate"
/label ~"type::feature" ~"feature::addition" ~"Documentation guidelines" 

I propose a feature to be added to the GitLab CI configuration, under rules or only keywords for specifying the job configuration, and that is **changes_exclude** which would do the opposite of the changes keyword, that is to exclude detection of changes in the specified paths. It should also be able to be bundled together with changes to exclude specific subpaths or files that the changes keyword specifies.

## Examples

This job would only run if there are changes detected in the README or CHANGELOGS file:

Docs:
  stage: test
  image: node:16-bullseye-slim
  script:
    - echo "Only docs were updated!"
    - exit 0
  tags:
    - docker
    - linux
  rules:
    - changes:
      - README.md
      - CHANGELOGS.md

And this job would only run if there are no changes detected in the README or CHANGELOGS files:

Project:
  stage: test
  image: node:16-bullseye-slim
  script:
    - echo "Docs were not updated!"
    - exit 0
  tags:
    - docker
    - linux
  rules:
    - changes_exclude:
      - README.md
      - CHANGELOGS.md

And finally, this job would run if there are changes detected in anything except README or CHANGELOGS files:

Project:
  stage: test
  image: node:16-bullseye-slim
  script:
    - echo "Everything but the docs was updated!"
    - exit 0
  tags:
    - docker
    - linux
  rules:
    - changes:
      - '*'
      changes_exlude:
      - README.md
      - CHANGELOGS.md