Allow --out to override --noEmit

[rtpg]

When setting up a default tsconfig.json file, we had initially put noEmit: true, so that people could run tsc to typecheck without generating a file (useful for some people's IDE configs and development styles).

It would be nice to be able to still use --out (or perhaps some other keyword if noEmit is meant to capture mistakes) so that we wouldn't need to modify our config to generate an output file, while not having people accidentally generate a bunch of files when calling without --out.

Current behavior is:

╰─$ tsc --out test.tsout
error TS5053: Option 'noEmit' cannot be specified with option 'out'.

[rtpg]

Sorry, I just realised that #7397 is an exact duplicate of this issue.