Show feature flag detail changes

Show detail changes in job console will be better.

before

feature_flag_changes is config/feature_flags/development/deployment_environment_manual_actions.yml
config/feature_flags/development/paginated_notes.yml
config/feature_flags/development/use_primary_and_secondary_stores_for_sidekiq_status.yml
config/feature_flags/development/use_primary_store_as_default_for_sidekiq_status.yml

after

diff --git a/config/feature_flags/development/deployment_environment_manual_actions.yml b/co>
deleted file mode 100644
index 47ab1b257f9..00000000000
--- a/config/feature_flags/development/deployment_environment_manual_actions.yml
+++ /dev/null
@@ -1,8 +0,0 @@
----
-name: deployment_environment_manual_actions
-introduced_by_url: https://gitlab.com/gitlab-org/gitlab/-/merge_requests/87138
-rollout_issue_url: https://gitlab.com/gitlab-org/gitlab/-/issues/362824
-milestone: '15.1'
-type: development
-group: group::release
-default_enabled: false
diff --git a/config/feature_flags/development/paginated_notes.yml b/config/feature_flags/dev>
deleted file mode 100644
index 733e23083d2..00000000000
--- a/config/feature_flags/development/paginated_notes.yml
+++ /dev/null
@@ -1,8 +0,0 @@
----
-name: paginated_notes
-introduced_by_url: https://gitlab.com/gitlab-org/gitlab/-/merge_requests/34628
-rollout_issue_url: https://gitlab.com/gitlab-org/gitlab/-/issues/254987
-milestone: '13.2'
-type: development
-group: group::code review
-default_enabled: false