[WIP] Migrate localization validations to Core

[cameronbarker]

WHY are these changes introduced?

Fixes #0000

WHAT is this pull request doing?

How to test your changes?

Post-release steps

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
• Existing analytics will cater for this addition
• PR includes analytics changes to measure impact

Checklist

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

[github-actions]

We detected some changes at packages/*/src and there are no updates in the .changeset.
If the changes are user-facing, run "pnpm changeset add" to track your changes and include them in the next release CHANGELOG.

[github-actions]

Coverage report

St.❔	Category	Percentage	Covered / Total
🟡	Statements	75.22% (+0.01% 🔼)	8841/11754
🟡	Branches	70.49% (+0.01% 🔼)	4291/6087
🟡	Functions	75.12% (+0% 🔼)	2313/3079
🟡	Lines	75.77% (+0.02% 🔼)	8360/11033

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 903 suites.

Report generated by 🧪jest coverage report action from eb1175a