Stop event_commit_title from escaping its output

Return a non-html-safe, unescaped String instead of ActiveSupport::SafeBuffer
to preserve safety when the output is misused. Currently there's oly one user,
which does the right thing.

Closes #23311
53 jobs for 23311-fix-double-escaping in 132 minutes and 38 seconds (queued for 29 seconds)
Status Job ID Name Coverage
  Prepare
passed #5234988
knapsack

00:00:22

 
  Test
passed #5235032
bundler:check

00:01:46

passed #5235025
license_finder

00:03:27

passed #5235031
lint-doc

00:01:12

passed #5235023
rake brakeman

00:05:08

failed #5245391
allowed to fail
rake ce_to_ee_merge_check

00:02:23

passed #5235028
rake db:migrate:reset

00:03:19

passed #5235029
rake db:seed_fu

00:04:20

passed #5235026
rake downtime_check

00:05:38

passed #5235024
rake flay

00:03:36

passed #5235021
rake haml_lint

00:02:33

passed #5235022
rake scss_lint

00:04:55

passed #5234989
rspec 0 20

00:20:54

passed #5234990
rspec 1 20

00:33:19

passed #5234999
rspec 10 20

00:33:47

passed #5235000
rspec 11 20

00:23:10

passed #5235001
rspec 12 20

00:29:53

passed #5235002
rspec 13 20

00:16:04

passed #5235003
rspec 14 20

00:13:05

passed #5235004
rspec 15 20

00:38:31

passed #5235005
rspec 16 20

00:28:47

passed #5235006
rspec 17 20

00:32:08

passed #5235007
rspec 18 20

00:36:44

passed #5235008
rspec 19 20

00:22:51

passed #5234991
rspec 2 20

00:38:44

passed #5234992
rspec 3 20

00:55:57

passed #5234993
rspec 4 20

00:45:01

passed #5234994
rspec 5 20

00:46:29

passed #5234995
rspec 6 20

00:52:25

passed #5234996
rspec 7 20

00:55:39

passed #5234997
rspec 8 20

01:06:05

passed #5234998
rspec 9 20

01:24:14

passed #5235020
rubocop

00:04:54

passed #5235009
spinach 0 10

00:09:18

passed #5245397
spinach 1 10

00:10:20

passed #5235011
spinach 2 10

00:14:28

passed #5235012
spinach 3 10

00:10:18

passed #5245383
spinach 4 10

00:11:42

passed #5235015
spinach 5 10

00:13:03

passed #5245396
spinach 6 10

00:08:52

passed #5245395
spinach 7 10

00:12:06

passed #5245394
spinach 8 10

00:08:51

passed #5245393
spinach 9 10

00:17:47

passed #5235030
teaspoon

00:06:52

failed #5235027
allowed to fail
rake ce_to_ee_merge_check

00:02:04

failed #5235010
spinach 1 10

00:06:49

failed #5235013
spinach 4 10

00:07:06

failed #5241175
spinach 4 10

00:04:11

failed #5235016
spinach 6 10

00:07:06

failed #5235017
spinach 7 10

00:07:24

failed #5235018
spinach 8 10

00:06:20

failed #5235019
spinach 9 10

00:08:37

 
  Post Test
passed #5235033
coverage

00:02:30

 
Name Stage Failure
failed
rake ce_to_ee_merge_check Test There is an unknown failure, please try again
  continue/finish the rebase. Note: You can squash the CE commits
before rebasing.
3. You can squash all the original 23311-fix-double-escaping commits into a
single "Port of 23311-fix-double-escaping to EE".
4. Push your branch to https://gitlab.com/gitlab-org/gitlab-ee.git:
$ git push origin 23311-fix-double-escaping-ee
=================================================================

ERROR: Build failed: exit code 1