chore(ui): migrate AppShellProvider and CodeBlock to TypeScript #1278

Job	Run time
install-dependencies	45s
license-headers / Apply LicenceHeader	0s
license-headers / Build LicenseEye	35s
reuse-compliance / reuse	28s
lint	1m 0s
format	50s
test	3m 11s
allowed-licenses	41s
type-check	1m 17s
	8m 47s

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