Add post_run for shadow executor #7895

Job	Run time
ubuntu-check	1h 7m 47s
ubuntu	1h 20m 30s
common (ubuntu-latest)	2m 16s
common (windows-latest)	3m 32s
common (macOS-latest)	3m 30s
bindings	7m 19s
build-docker	19m 9s
executions-check (ubuntu-latest)	16m 52s
fuzzers (ubuntu-latest)	3h 37m 33s
executions-check (macos-latest)	23m 33s
fuzzers (macos-latest)	2h 56m 24s
macos	8m 30s
nostd-build	2m 51s
ubuntu-concolic	1m 57s
windows	35m 33s
Simple build in FreeBSD	6h 0m 6s
other_targets	6m 11s
	17h 13m 33s

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