[Themes] Add support for theme blocks in theme package command

[jamesmengo]

WHY are these changes introduced?

This is a port / copy of @montalvomiguelo's original PR #5139 - Opened a new branch here to remediate CI failures

Fixes #5135

WHAT is this pull request doing?

Adds support for packaging theme blocks by including the blocks/** pattern in the theme files pattern list. This ensures that block files are properly included when packaging themes.

How to test your changes?

1. Create a theme with blocks in the blocks/ directory
2. Run the theme package command
3. Verify that block filess are included in the packaged output
4. Test with a sample block file (e.g., blocks/product-grid.liquid)

Measuring impact

• n/a - this doesn't need measurement, e.g. a linting rule or a bug-fix

Checklist

• I've considered possible cross-platform impacts (Mac, Linux, Windows)
• I've considered possible documentation changes

[jamesmengo]

• [Themes] Add support for theme blocks in theme package command #5158 👈 (View in Graphite)
• main

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[github-actions]

Coverage report

St.❔	Category	Percentage	Covered / Total
🟡	Statements	75.31%	8841/11740
🟡	Branches	70.56%	4290/6080
🟡	Functions	75.21%	2315/3078
🟡	Lines	75.85% (+0.01% 🔼)	8358/11019

Show files with reduced coverage 🔻

St.❔	File	Statements	Branches	Functions	Lines
🟢	... / app-event-watcher.ts	93.83% (-1.23% 🔻)	86.49% (-2.7% 🔻)	90.48%	98.61%

Test suite run success

1994 tests passing in 902 suites.

Report generated by 🧪jest coverage report action from 9d47c0f

[aswamy]

✅

[jamesmengo]

/shipit

[gracejychang]

🎉 thanks James! just curious, why was CI failing on the original PR?

[jamesmengo]

I didn't have time to dig into exactly why CI was failing - it could be either due to an outdated branch (needs rebase, or due to the branch coming from a forked version of the Repo. I suspect we would have to investigate the actions themselves.

My money is on the latter, though I'm optimistically hoping that it's the former reason.