Draft: Remove unused .branch-info .commit-icon styles

What does this MR do and why?

Migrate some styles out of commits.scss to page specific bundles.

• .commit-description
  • app/views/projects/commit/_commit_box.html.haml
  • app/views/shared/wikis/diff.html.haml
• .commit-row-description
  • app/views/projects/commits/_commit.html.haml
  • ee/app/assets/javascripts/vue_merge_request_widget/components/ai_commit_message.vue -> app/views/projects/merge_requests/_widget.html.haml
  • app/assets/javascripts/diffs/components/commit_item.vue -> app/views/projects/merge_requests/_page.html.haml
  • app/assets/javascripts/repository/components/last_commit.vue -> app/views/projects/_files.html.haml
• .commit-box
  • app/views/projects/commit/_commit_box.html.haml
• .pipeline-info .status-icon-container
  • Removed as it did not seem to be used anywhere.
• .branch-info .commit-icon
  • Unused since 3f56fd65, removed.
• .commit-message-container
  • app/views/shared/_commit_message_container.html.haml: The style does not seem to be applied properly here so I did not backport it.
  • app/assets/javascripts/merge_conflicts/merge_conflict_resolver_app.vue -> app/views/projects/merge_requests/conflicts/show.html.haml
• .commit-row-title .str-truncated
  • app/views/projects/commits/_inline_commit.html.haml
• .commits-row
  • app/views/projects/commits/_commits.html.haml
• .text-expander: Probably needs to be global as it's used in the breadcrumbs. Moved to framework.scss.
  • app/assets/javascripts/repository/components/last_commit.vue -> app/views/projects/_files.html.haml
  • app/assets/javascripts/vue_shared/components/expand_button.vue
    • app/views/projects/releases/show.html.haml
    • app/views/projects/releases/index.html.haml
  • app/views/projects/commits/_commit.html.haml
  • app/views/layouts/nav/breadcrumbs/_collapsed_inline_list.html.haml
• .commit.flex-list: Apparently not used anywhere, removed.
• .avatar-cell img: Removed altogether as it didn't seem to be actually applied anywhere.
  • app/assets/javascripts/diffs/components/commit_item.vue
    • app/views/projects/commits/_commits.html.haml: Not actually initialized here.
    • app/views/projects/merge_requests/_commits.html.haml: Seems unnecessary here
  • app/views/projects/commits/_commit.html.haml: Overridden, no need to backport.
  • app/views/search/results/_user.html.haml: Overridden, no need to backport.
• .add-review-item
• .add-review-item-modal
  • app/assets/javascripts/add_context_commits_modal/components/add_context_commits_modal_wrapper.vue
    • app/views/projects/commits/_commits.html.haml
    • app/views/projects/merge_requests/_commits.html.haml

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Related to #239804