test: improve language service tests performance

[alan-agius4]

With this change we reduce the amount of IO operations. This is especially a huge factor in windows since IO ops are slower.

With this change mainly we cache existsSync and readFileSync calls

Here's the results

Before

//packages/language-service/test:test
INFO: Elapsed time: 258.755s, Critical Path: 253.91s

After

//packages/language-service/test:test
INFO: Elapsed time: 66.403s, Critical Path: 63.13s

[alan-agius4]

On codefresh CI

Before

//packages/language-service/test:test                                    PASSED in 297.9s 

With the change

//packages/language-service/test:test                                    PASSED in 111.6s 

That shaves off approx 3mins

//cc @filipesilva

[IgorMinar]

Is it right that this is master only PR?

[alan-agius4]

@IgorMinar, no it’s should be master & patch.

Thanks for highlighting it.

[matsko]

@alan-agius4 @IgorMinar I merged this only to master ... let me know if this was the correct thing to do.

[alan-agius4]

@matsko, can you please merge it to patch as well? Or it doesn’t apply cleanly?

[matsko]

It doesn't apply cleanly. Can you create another PR based on the patch branch and I will merge it in?

[matsko]

Patch being 8.x

[alan-agius4]

@matsko, yes, will do that on Monday and I’ll ping you, as I away for the weekend.

[alan-agius4]

@matsko, here's the patch version #30683

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