Add pin rows to Profile Memory table (#9832)

* Add pin rows to Profile Memory table

* Update packages/devtools_app/lib/src/screens/memory/panes/profile/profile_pane_controller.dart

Co-authored-by: gemini-code-assist[bot] <176961590+gemini-code-assist[bot]@users.noreply.github.com>

* Update packages/devtools_app/lib/src/screens/memory/panes/profile/profile_view.dart

Co-authored-by: gemini-code-assist[bot] <176961590+gemini-code-assist[bot]@users.noreply.github.com>

* fix issues

* Tighten pin column and show icon on hover

* 32->10

* fix pin hover test

* update img

* Remove unused pin helpers.

* Update profile tab golden.

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Co-authored-by: gemini-code-assist[bot] <176961590+gemini-code-assist[bot]@users.noreply.github.com>