Add highlight for instance group dock

[justinvshen]

Description

add highlighting feature for row in instance group dock

Types of changes

• [ ] Bugfix
• [X] New feature
• [ ] Refactor / Code style update (no logical changes)
• [ ] Build / CI changes
• [ ] Documentation Update
• [ ] Other (explain)

Does this address any currently open issues?

[list open issues here]

Outside contributors checklist

• [ ] Review the guidelines for contributing to this repository
• [ ] Read and sign the CLA and add yourself to the authors list
• [ ] Make sure you are making a pull request against the develop branch (not main). Also you should start your branch off develop
• [ ] Add tests that prove your fix is effective or that your feature works
• [ ] Add necessary documentation (if appropriate)

Thank you for contributing to SLEAP!

:heart:

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[codecov[bot]]

Codecov Report

Attention: Patch coverage is 73.33333% with 4 lines in your changes missing coverage. Please review.

Project coverage is 74.18%. Comparing base (0f9fe25) to head (df35086).

Files	Patch %	Lines
sleap/gui/widgets/video.py	73.33%	4 Missing :warning:

Additional details and impacted files

```diff @@ Coverage Diff @@ ## liezl/add-gui-elements-for-sessions #1860 +/- ## ======================================================================= - Coverage 74.18% 74.18% -0.01% ======================================================================= Files 135 135 Lines 25425 25438 +13 ======================================================================= + Hits 18862 18871 +9 - Misses 6563 6567 +4 ```

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