[Cherry-pick] DYN-: [DYN-8642] Freeze groups : add icon

[github-actions]

Cherry-pick of #16158 to RC3.5.1_master

Purpose

This PR addresses DYN-8642. It adds an icon to frozen groups.

• The frozen icon is displayed next to the collapse icon in the group header.
• Users can click the frozen icon to unfreeze the group.
• The icon includes a tooltip and a hover state, it has the same behavior as the collapse and context menu buttons.
• When the group is zoomed out, the frozen icon is still shown - but only when the group is collapsed, since expanded nodes are rendered on top of the group and would obscure the button.
• The frozen icon has the same functionality in the zoomed-out, collapsed state.
• When zoomed in, the icon switches between light blue and dark blue based on the group header’s background. When zoomed out, the icon uses the dark version only, as the lighter group body makes the light icon hard to see.

Declarations

Check these if you believe they are true

• The codebase is in a better state after this PR
• Is documented according to the standards
• The level of testing this PR includes is appropriate
• User facing strings, if any, are extracted into *.resx files
• All tests pass using the self-service CI.
• Snapshot of UI changes, if any.
• Changes to the API follow Semantic Versioning and are documented in the API Changes document.
• This PR modifies some build requirements and the readme is updated
• This PR contains no files larger than 50 MB

Release Notes

Added a frozen icon to groups with tooltip and click-to-unfreeze functionality, visible when both zoomed-in and zoomed-out.

Reviewers

@reddyashish
@zeusongit

FYIs

@dnenov
@achintyabhat