Add MockVariablePolicyHelperLib #3629

Job	Run time
Gather Repo Packages	6s
Analyze (CryptoPkg)	10m 2s
Analyze (MdeModulePkg)	20m 46s
Analyze (MdePkg)	10m 55s
Analyze (NetworkPkg)	11m 39s
Analyze (PcAtChipsetPkg)	9m 0s
Analyze (PolicyServicePkg)	10m 33s
Analyze (ShellPkg)	12m 19s
Analyze (StandaloneMmPkg)	8m 16s
Analyze (UefiCpuPkg)	12m 53s
Analyze (UnitTestFrameworkPkg)	7m 37s
	1h 54m 6s

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