Remove code related to prepend and fix baselines

[sheetalkamat]

• Removes all the APIs and call related prepend and corresponding tests
• Fixed the tests that didnt depend on prepend
• Also fixed issue with tsserver not baselining the version as FakeMajor.FakeMinor when the callbacks were baselined by passing around the logs

[typescript-bot]

Looks like you're introducing a change to the public API surface area. If this includes breaking changes, please document them on our wiki's API Breaking Changes page.

Also, please make sure @DanielRosenwasser and @RyanCavanaugh are aware of the changes, just as a heads up.

[sheetalkamat]

Package size report

Overall package size

	Before	After	Diff	Diff (percent)
Packed	5.55 MiB	5.53 MiB	-26.18 KiB	-0.46%
Unpacked	30.86 MiB	30.72 MiB	-143.91 KiB	-0.46%

Files

	Before	After	Diff	Diff (percent)
lib/tsc.js	5.62 MiB	5.58 MiB	-43.71 KiB	-0.76%
lib/tsserver.js	8.24 MiB	8.19 MiB	-45.31 KiB	-0.54%
lib/typescript.d.ts	584.73 KiB	580.04 KiB	-4.69 KiB	-0.80%
lib/typescript.js	8.72 MiB	8.67 MiB	-47.20 KiB	-0.53%
lib/typingsInstaller.js	1.68 MiB	1.68 MiB	-3.01 KiB	-0.17%

[DanielRosenwasser]

I feel a bit mixed - it's a little hard to read it casually (thanks GitHub), but what I want to know is:

• will users still get an error message explaining why --prepend no longer works?
• will the language service stop functioning correctly on projects using --prepend?

If the language service stops working, it means we'll be unable to browse the code of TypeScript 4.9 and earlier with TypeScript 5.5+.

[jakebailey]

If the language service stops working, it means we'll be unable to browse the code of TypeScript 4.9 and earlier with TypeScript 5.5+.

IIRC prepend only affected emit, so I would think that everything would still be browsable, but I have not checked myself.

[sheetalkamat]

@jakebailey said it correctly.. this affects emit and it shouldnt impact the LS at all.
We do error that prepend is not supported but thats all. the actual functionality of prepending is removed now.

[RyanCavanaugh]

Does this belong in its own PR? Looks unrelated

[sheetalkamat]

This was related to baseline i fixed so added it here.

[sheetalkamat]

As part of 1012104 and c871a27