Track and use last known remote hash in pullv2 #10210

Job	Run time
ormolu	16s
build ucm (ubuntu-20.04)	7m 15s
build ucm (macos-13)	8m 30s
build ucm (windows-2019)	12m 29s
generate jit source	6s
run interpreter tests (ubuntu-20.04)	56s
run transcripts (ubuntu-20.04)	3m 57s
run interpreter tests (macos-13)	1m 51s
run transcripts (macos-13)	7m 0s
run transcripts (windows-2019)	7m 45s
build jit binary / build jit binary (ubuntu-20.04)	8s
build jit binary / build jit binary (macos-13)	17s
build jit binary / build jit binary (windows-2019)	15s
test jit / test jit (ubuntu-20.04)	8s
test jit / test jit (macos-13)	14s
	51m 7s

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