Add use of `SetAndCheckTenantSetting` function throughout PnP testplan #3448

Job	Run time
Lint / MegaLint YAML Check	28s
Syntax / Markdown Syntax Checks	36s
Lint / PowerShell Check	43s
Security / MegaLint Checkov	1m 15s
Security / MegaLint Gitleaks	48s
Unit / OPA Unit Tests	23s
Unit / PowerShell Unit Tests	47s
	5m 0s

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