fix(table): preserve version hint URIs in orphan cleanup

[fallintoplace]

Summary

build the orphan-cleanup version-hint path with a URI-aware join for URL locations
keep the existing filepath join fallback for plain local filesystem paths
add regression coverage for URI and local-path version-hint construction, plus the referenced-file set

Why

Table.getReferencedFiles adds metadata/version-hint.text to the referenced set so orphan cleanup will not delete it. That path was being built with filepath.Join(metadata.Location(), ...), which is fine for plain local paths but corrupts object-store URIs like s3://bucket/table into s3:/bucket/table/....

Once that malformed path hit orphan cleanup's normalizer, it no longer looked like a URL and could diverge from the real s3://.../version-hint.text candidate path. That made the real version-hint file eligible to be treated as an orphan.

Testing

go test ./table -run 'Test(VersionHintLocation|GetReferencedFiles_IncludesStatisticsFiles|.Orphan.)$' -count=1
go test ./table -count=1
go run github.com/golangci/golangci-lint/v2/cmd/golangci-lint@v2.11.4 run --timeout=10m ./table/...
git diff --check

[tanmayrauth]

Clean fix and the write→read round-trip holds for s3/gs/file URIs and local paths alike. Just one small test-coverage nit. Details inline.

[tanmayrauth]

Nice catch adding || strings.HasPrefix(tableLocation, "file:") — since file:///x and file://host/x already contain ://, this branch is really only here to cover the single-slash file:/x opaque form. Just confirming that's the intent.

[tanmayrauth]

The three cases here all either contain :// (s3, file:///) or fall through to filepath.Join (local), so none of them actually exercise the file:-prefix-only branch above. A file:/tmp/table → file:/tmp/table/metadata/version-hint.text case would lock in the one input that branch uniquely guards.