Merge branch '22191-delete-dynamic-envs-mr' of gitlab.com:gitlab-org/gitlab-ce into 22191-delete-dynamic-envs-mr

Merge branch '22191-delete-dynamic-envs-mr' of gitlab.com:gitlab-org/gitlab-ce into 22191-delete-dynamic-envs-mr

Add RTL support to Markdown rendering

See merge request !6296

Fix trending projects Spinach failure

The trending projects list is now pre-calculated. To make this work with the Spinach test, we have to manually refresh the list.
    
Partial fix to #23378

See merge request !6911

Fix broken rspec in compare text

!6910 changed the filter text from "Filter by branch/tag" to "Filter by Git revision"

See merge request !6926

!6910 changed the filter text from "Filter by branch/tag" to "Filter by Git revision"

Fix broken Spinach tests caused by changes in !6550

!6550 added dropdowns for the branch "from" and "to" fields, but these Spinach tests were not updated accordingly.

Partial fix to #23378

See merge request !6910

Partial fix to #23378

Fix active tab test for branches page

For https://gitlab.com/gitlab-org/gitlab-ce/issues/23378

See merge request !6923

Fix Spinach merge request diff failures

gitlab-git-test `master` was updated in ff076d88, and this caused the merge request diffs to change in a way that broke assumptions in the Spinach tests.
    
Partial fix to #23378

See merge request !6916

Convert CHANGELOG to Markdown

All this does is convert the version sections into headers. The list
items shouldn't really be indented by two spaces, but it makes no
difference to the rendering and this way we retain authorship history
for the actual changes.

Related to https://gitlab.com/gitlab-org/release-tools/merge_requests/29

[ci skip]

See merge request !6925

All this does is convert the version sections into headers. The list
items shouldn't really be indented by two spaces, but it makes no
difference to the rendering and this way we retain authorship history
for the actual changes.

Related to https://gitlab.com/gitlab-org/release-tools/merge_requests/29

Add the tech writers usernames in the doc_sytleguide doc

See merge request !6924

# Conflicts:
#   doc/development/doc_styleguide.md

Signed-off-by: Dmitriy Zaporozhets <dmitriy.zaporozhets@gmail.com>

Signed-off-by: Dmitriy Zaporozhets <dmitriy.zaporozhets@gmail.com>

Signed-off-by: Dmitriy Zaporozhets <dmitriy.zaporozhets@gmail.com>

Fix 500 error when creating mileston from group page

Part of https://gitlab.com/gitlab-org/gitlab-ce/issues/23378

See merge request !6920