safekeeper: add separate `tombstones` map for deleted timelines #23397

Job	Run time
check-permissions / check-permissions	1s
cancel-previous-e2e-tests	3s
tag	37s
check-build-tools-image / check-image	15s
build-build-tools-image / check-image / check-image	3s
build-build-tools-image / build-image	0s
build-build-tools-image / merge-images	0s
check-codestyle-rust	19m 57s
check-codestyle-python	3m 5s
get-benchmarks-durations	0s
neon-image-arch (x64)	6m 47s
compute-node-image-arch (v14, x64)	5m 5s
neon-image-arch (arm64)	13m 30s
build-neon (debug)	15m 51s
compute-node-image-arch (v14, arm64)	10m 32s
build-neon (release)	16m 54s
compute-node-image-arch (v15, x64)	5m 13s
compute-node-image-arch (v15, arm64)	12m 9s
trigger-custom-extensions-build-and-wait	10m 11s
compute-node-image-arch (v16, x64)	6m 7s
compute-node-image-arch (v16, arm64)	11m 23s
compute-node-image (v14)	14s
compute-node-image (v15)	12s
compute-node-image (v16)	20s
vm-compute-node-image (v14)	1m 41s
vm-compute-node-image (v15)	1m 35s
vm-compute-node-image (v16)	1m 37s
neon-image	39s
test-images (x64)	10m 49s
test-images (arm64)	15m 32s
regress-tests (debug, v14)	22m 30s
regress-tests (debug, v15)	23m 49s
regress-tests (debug, v16)	21m 55s
regress-tests (release, v14)	14m 47s
benchmarks	0s
regress-tests (release, v15)	12m 20s
regress-tests (release, v16)	12m 37s
coverage-report (debug)	6m 36s
promote-images	1m 14s
conclusion	1s
promote-compatibility-data	0s
pin-build-tools-image	0s
deploy	0s
trigger-e2e-tests / cancel-previous-e2e-tests	1s
trigger-e2e-tests / tag	7s
trigger-e2e-tests / trigger-e2e-tests	52s
create-test-report	2m 7s
report-benchmarks-failures	0s
	4h 49m 18s

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