Add fast path exits if we are retaining all configured projects

[sheetalkamat]

If we are retaining all configured projects adds multiple checks for early exits instead of iterating through all open files

Possibly fixes #59335

[sheetalkamat]

@typescript-bot pack this

[typescript-bot]

Starting jobs; this comment will be updated as builds start and complete.

Command	Status	Results
pack this	✅ Started	✅ Results

[typescript-bot]

Hey @sheetalkamat, I've packed this into an installable tgz. You can install it for testing by referencing it in your package.json like so:

{
    "devDependencies": {
        "typescript": "https://typescript.visualstudio.com/cf7ac146-d525-443c-b23c-0d58337efebc/_apis/build/builds/163379/artifacts?artifactName=tgz&fileId=DB07ADC14099E408AFC3DBBEC11EC9732D00FF6B99DCA0A926B01F338FC3723D02&fileName=/typescript-5.6.0-insiders.20240819.tgz"
    }
}

and then running npm install.

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There is also a playground for this build and an npm module you can use via "typescript": "npm:@typescript-deploys/pr-build@5.6.0-pr-59689-2".;