refactor: postgres_backend: replace abstract shutdown_watcher with CancellationToken #23449

Job	Run time
check-permissions / check-permissions	1s
cancel-previous-e2e-tests	1s
tag	10s
check-build-tools-image / check-image	4s
build-build-tools-image / check-image / check-image	7s
trigger-custom-extensions-build-and-wait	6m 26s
build-build-tools-image / build-image	0s
build-build-tools-image / merge-images	0s
check-codestyle-rust	16m 48s
check-codestyle-python	32s
build-neon (debug)	15m 14s
build-neon (release)	14m 48s
neon-image-arch (x64)	6m 38s
compute-node-image-arch (v14, x64)	5m 12s
neon-image-arch (arm64)	12m 56s
compute-node-image-arch (v14, arm64)	10m 0s
get-benchmarks-durations	0s
compute-node-image-arch (v15, x64)	5m 22s
compute-node-image-arch (v15, arm64)	11m 12s
compute-node-image-arch (v16, x64)	5m 17s
compute-node-image-arch (v16, arm64)	10m 51s
compute-node-image (v14)	13s
compute-node-image (v15)	13s
compute-node-image (v16)	17s
vm-compute-node-image (v14)	1m 42s
vm-compute-node-image (v15)	1m 35s
vm-compute-node-image (v16)	1m 43s
neon-image	1m 7s
test-images (x64)	13m 7s
test-images (arm64)	16m 28s
regress-tests (debug, v14)	25m 29s
regress-tests (debug, v15)	21m 52s
regress-tests (debug, v16)	24m 35s
benchmarks	0s
regress-tests (release, v14)	11m 8s
regress-tests (release, v15)	11m 5s
regress-tests (release, v16)	11m 6s
coverage-report (debug)	5m 45s
create-test-report	1m 59s
report-benchmarks-failures	0s
conclusion	1s
promote-images	55s
pin-build-tools-image	0s
deploy	0s
trigger-e2e-tests	0s
promote-compatibility-data	0s
	4h 31m 59s

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