fix(shwap/bitswap): Blockstore.GetSize: getting size with no compute #9608

Job	Run time
Markdown Lint	10s
setup	1s
yamllint	6s
hadolint / hadolint	9s
goreleaser	0s
upload-docs	0s
go-ci / Setup	1s
go-ci / Lint Imports	7s
go-ci / Go Mod Tidy Check	26s
go-ci / Unit Tests Coverage (ubuntu-latest)	5m 14s
go-ci / Lint	2m 18s
go-ci / Unit Tests Coverage (macos-14)	3m 53s
go-ci / Integration Tests / Integration Tests API	2m 32s
go-ci / Integration Tests / Integration Tests Blob	2m 43s
go-ci / Integration Tests / Da Tests Sync	2m 41s
go-ci / Integration Tests / Integration Tests ND	2m 49s
go-ci / Integration Tests / Integration Tests Fraud	2m 26s
go-ci / Integration Tests / Integration Tests p2p	2m 51s
go-ci / Integration Tests / Integration Tests Sync	3m 9s
go-ci / Integration Tests / Integration Tests Reconstruction	2m 23s
go-ci / Integration Tests / Integration Tests Sync	2m 34s
	36m 33s

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