Handle some flaky ProjectAnalysisTests cases

[majocha]

Description

Test cases utilizing Project25 do not like to run concurrently with each other. Probably because of the XmlProvider here:

fsharp/tests/FSharp.Compiler.Service.Tests/ProjectAnalysisTests.fs

Lines 3666 to 3675 in 749853e

	module internal Project25 =
	let fileName1 = Path.ChangeExtension(getTemporaryFileName (), ".fs")
	let base2 = getTemporaryFileName ()
	let dllName = Path.ChangeExtension(base2, ".dll")
	let projFileName = Path.ChangeExtension(base2, ".fsproj")
	let fileSource1 = """
	module TypeProviderTests
	open FSharp.Data
	type Project = XmlProvider<"<root><value>1</value><value>3</value></root>">

I verified locally by running some iterations that marking the affected test cases with RunTestCasesInSequence resolves the problem.

[github-actions]

✅ No release notes required

[psfinaki]

/azp run

[azure-pipelines]

Azure Pipelines successfully started running 2 pipeline(s).

[psfinaki]

This PR is particularly unlucky...

[majocha]

Ah, this particular failure is unrelated but a genuine bug. I'll sort it out.

[psfinaki]

Thanks @majocha for your continuous interest 😎