refactor LoadPreviousBuildOptionsMap in a function #3147

Job	Run time
run-determination	1s
package-name-prefix	3s
Create artifact Windows_X86-32	2m 4s
Create artifact Windows_X86-64	1m 54s
Create artifact Linux_X86-32	1m 40s
Create artifact Linux_X86-64	1m 39s
Create artifact Linux_ARMv6	1m 42s
Create artifact Linux_ARMv7	1m 27s
Create artifact Linux_ARM64	1m 37s
Create artifact macOS_64	1m 58s
Create artifact macOS_ARM64	2m 47s
Create artifact rpc-protocol-files	15s
Create artifact configuration-schema	15s
checksums	10s
	17m 32s

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