Removed picked changelog entries

changelogs/unreleased/34008-fix-CI_ENVIRONMENT_URL-2.yml

----
-title: Fix passing CI_ENVIRONMENT_NAME and CI_ENVIRONMENT_SLUG for CI_ENVIRONMENT_URL
-merge_request: 12344
-author:

changelogs/unreleased/add-ci_variables-environment_scope-mysql.yml

----
-title: Rename duplicated variables with the same key for projects. Add environment_scope
-  column to variables and add unique constraint to make sure that no variables could
-  be created with the same key within a project
-merge_request: 12363
-author: