feat: Add filtering for unchanged apps in unit tests

[amattu2]

Overview

This PR adjusts the unit test workflow to address some minor issues:

1. If a app does not have any changes to itself or dependents, skip running unit tests for it
2. Upgrade the outdated actions dependencies that rely on Node 20 (e.g. checkout)
3. Remove unnecessary slack notification from workflow

TODO:

• Test different changes to apps
• Squash and recommit all of the testing commits into one

[relativeci]

#323 Bundle Size — 12.89MiB (0%).

a664fc0(current) vs ec7f608 3.7.0#322(baseline)

Warning

Bundle contains 54 duplicate packages – View duplicate packages

Bundle metrics  no changes

	Current #323	Baseline #322
Initial JS	879.62KiB	879.62KiB
Initial CSS	0B	0B
Cache Invalidation	0%	28.67%
Chunks	75	75
Assets	118	118
Modules	9174	9174
Duplicate Modules	0	0
Duplicate Code	0%	0%
Packages	320	320
Duplicate Packages	53	53

Bundle size by type  no changes

	Current #323	Baseline #322
JS	10.37MiB	10.37MiB
IMG	1.72MiB	1.72MiB
Fonts	805.07KiB	805.07KiB
CSS	18KiB	18KiB

Bundle analysis report Branch feat/skip-unchanged-apps Project dashboard

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