feat(ui): lazy-load phone country code data #27019

Job	Run time
Check Permissions	6s
Build Packages	0s
Publish with pkg-pr-new	0s
Integration Tests (${{ matrix.test-name }}, ${{ matrix.test-project }}${{ ((matrix.next-version && format(', {0}', matrix.next-version)) \|\| '') }})	-1s
Formatting \| Dedupe \| Changeset	-1s
Unit Tests (${{ matrix.filter-label }})	-1s
Static analysis	-1s
	2s

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