.github/workflows: Add Stale Check #518

Job	Run time
Analyze (ArmPkg, IA32,X64)	12m 22s
Analyze (CryptoPkg, IA32)	26m 5s
Analyze (CryptoPkg, X64)	28m 52s
Analyze (DynamicTablesPkg, IA32,X64)	12m 3s
Analyze (FatPkg, IA32,X64)	19m 29s
Analyze (FmpDevicePkg, IA32,X64)	15m 9s
Analyze (IntelFsp2Pkg, IA32,X64)	17m 26s
Analyze (IntelFsp2WrapperPkg, IA32,X64)	19m 6s
Analyze (MdeModulePkg, IA32)	28m 39s
Analyze (MdeModulePkg, X64)	27m 57s
Analyze (MdePkg, IA32,X64)	21m 56s
Analyze (PcAtChipsetPkg, IA32,X64)	17m 11s
Analyze (PrmPkg, IA32,X64)	17m 50s
Analyze (SecurityPkg, IA32,X64)	20m 12s
Analyze (ShellPkg, IA32,X64)	21m 30s
Analyze (SourceLevelDebugPkg, IA32,X64)	18m 6s
Analyze (StandaloneMmPkg, IA32,X64)	15m 4s
Analyze (UefiCpuPkg, IA32,X64)	21m 52s
Analyze (UnitTestFrameworkPkg, IA32,X64)	16m 29s
	6h 17m 18s

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