Test

test: Add Test-PSBuildPester integration tests and fix latent bugs #155

Job	Run time
CI / Run Linters	20s
CI / Run Pwsh Tests (windows-latest)	1m 59s
CI / Run Pwsh Tests (ubuntu-latest)	1m 27s
CI / Run Tests (Windows PowerShell 5.1)	3m 23s
CI / Run Pwsh Tests (macOS-latest)	54s
CI / Publish Unit Tests Results	19s
	8m 22s

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