[pruner] introduce indexes pruner #82111

Job	Run time
check-protos	8s
license-check	1m 5s
diff	6s
simtest	17m 8s
clippy	3m 37s
move-test	0s
rustfmt	19s
test (ubuntu-ghcloud)	36m 6s
test-extra (ubuntu-ghcloud)	28m 31s
test-extra	0s
test	0s
windows-build (windows-ghcloud)	9m 17s
cargo-deny (bans, licenses, sources)	48s
cargo-deny (advisories)	38s
cutting a new execution layer	1m 19s
	1h 39m 2s

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