feat(lsp): add asset cache regression test

When we migrated away from all the locks, there was a regression that
was not caught immediately. The tsc::get_asset() would attempt to modify
the snapshot, but the problem was that the snapshot was a .clone() of
the inner language server's assets, which meant that modifications to
that where lost. When we then attempted to do a hover on those assets,
the inner language servers assets didn't have the retrieved asset, and
therefore would throw an error.

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