chore: remove obsolete nft_custody_unanchored table #2663

Job	Run time
test (api)	10m 20s
test-2_5 (block-zero-handling)	1m 25s
test (bns)	3m 13s
test-2_5 (faucet-stx)	1m 25s
lint	55s
test (bns-e2e)	7m 6s
test-2_5 (pox-4-btc-address-formats)	2m 1s
test-2_5 (pox-4-delegate-aggregation)	1m 59s
test (btc-faucet)	1m 29s
test-2_5 (pox-4-delegate-stacking)	1m 48s
test-rosetta (rosetta)	3m 7s
test (event-replay)	1m 54s
test-2_5 (pox-4-delegate-revoked-stacking)	2m 0s
test (rpc)	1m 27s
test-rosetta (rosetta-construction)	2m 15s
test-2_5 (pox-4-stack-extend-increase)	2m 11s
test-2_5 (pox-4-rosetta-btc-addr-types)	4m 47s
test-rosetta (rosetta-cli-data)	2m 5s
test-2_5 (pox-4-rosetta-cycle-phases)	1m 21s
test-rosetta (rosetta-cli-construction)	2m 17s
test-2_5 (pox-4-rosetta-segwit)	1m 30s
test-2_5 (pox-4-burnchain-stack-stx)	1m 35s
test-2_5 (pox-4-burnchain-delegate-stx)	1m 37s
build-publish	0s
	59m 47s

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