chore: remove language selector

[r0b1n]

This package is replaced by combobox in both version of atlas core.

[github-actions]

AI Code Review

✅ Approved — no issues found

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What was reviewed

File	Change
.github/configs/labeler.yml	Removed language-selector-web label rule
packages/pluggableWidgets/language-selector-web/**	Entire package deleted (source, XML, SCSS, tests, e2e, assets, typings, config)
pnpm-lock.yaml	Lockfile updated to reflect package removal

Skipped (out of scope): pnpm-lock.yaml (lockfile-only changes)

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Positives

• Complete and clean removal — every file in the package directory deleted, no orphaned references left anywhere in the repo
• Labeler configuration updated in lockstep with the package deletion, preventing stale label-matching rules
• Workspace config uses a packages/*/* glob so no explicit exclusion was needed — the removal is automatically effective
• PR title follows conventional commits (chore:) and the description clearly states the replacement (combobox widget in Atlas core)