Add neon.running_xacts_overflow_policy to make it possible for RO replica to startup without primary even in case running xacts overflow #23606

Job	Run time
check-permissions / check-permissions	1s
tag	12s
cancel-previous-e2e-tests	9s
check-build-tools-image / check-image	6s
build-build-tools-image / check-image / check-image	4s
trigger-custom-extensions-build-and-wait	4m 19s
build-build-tools-image / build-image	0s
build-build-tools-image / merge-images	0s
check-codestyle-python	22s
build-neon (debug)	15m 14s
check-codestyle-rust	16m 29s
build-neon (release)	16m 1s
compute-node-image-arch (v14, x64)	5m 21s
compute-node-image-arch (v14, arm64)	9m 55s
get-benchmarks-durations	0s
neon-image-arch (x64)	8m 58s
compute-node-image-arch (v15, x64)	5m 36s
neon-image-arch (arm64)	15m 35s
compute-node-image-arch (v15, arm64)	9m 52s
compute-node-image-arch (v16, x64)	18m 1s
compute-node-image-arch (v16, arm64)	27m 57s
neon-image	47s
regress-tests (debug, v14)	48m 57s
regress-tests (debug, v15)	23m 52s
regress-tests (debug, v16)	48m 2s
regress-tests (release, v14)	12m 18s
regress-tests (release, v15)	13m 17s
regress-tests (release, v16)	11m 21s
benchmarks	0s
compute-node-image (v14)	32s
compute-node-image (v15)	27s
compute-node-image (v16)	22s
test-images (x64)	13m 2s
test-images (arm64)	12m 37s
vm-compute-node-image (v14)	1m 49s
vm-compute-node-image (v15)	3m 2s
vm-compute-node-image (v16)	2m 19s
promote-images	1m 17s
trigger-e2e-tests / cancel-previous-e2e-tests	1s
trigger-e2e-tests / tag	8s
trigger-e2e-tests / trigger-e2e-tests	1m 3s
conclusion	1s
pin-build-tools-image	0s
deploy	0s
promote-compatibility-data	0s
coverage-report	0s
create-test-report	2m 0s
report-benchmarks-failures	0s
	5h 51m 26s

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