Theme info rework

[amcaplan]

WHY are these changes introduced?

Applying the changes in #5170 to themes as well.

WHAT is this pull request doing?

1. Uses standardized UI Kit components
2. Removes the version warning - since we warn daily and issue notifications, it doesn't add value here.

Before:

After:

How to test your changes?

shopify theme info

By the way, I noticed that this command doesn't take a --path variable, is that just an oversight? I definitely added one for local testing.

Measuring impact

How do we know this change was effective? Please choose one:

• 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

[github-actions]

Coverage report

St.❔	Category	Percentage	Covered / Total
🟡	Statements	75.11%	8878/11820
🟡	Branches	70.26%	4337/6173
🟡	Functions	75.04%	2324/3097
🟡	Lines	75.67% (+0.01% 🔼)	8394/11093

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

2005 tests passing in 905 suites.

Report generated by 🧪jest coverage report action from 1b8ad07

[karreiro]

Thank you, @amcaplan! Very nice enhancement and clean-up ✨ :)