internal/sarif: remove originalURIBaseIds

We don't need it and it is not actually needed. Sarif validator is fine
without it and so is Github Code scanning.

Updates golang/go#61347

Change-Id: I1d368422935fddd6b9960917010287ae7bca2683
Reviewed-on: https://go-review.googlesource.com/c/vuln/+/581076
Run-TryBot: Zvonimir Pavlinovic <zpavlinovic@google.com>
Auto-Submit: Zvonimir Pavlinovic <zpavlinovic@google.com>
LUCI-TryBot-Result: Go LUCI <golang-scoped@luci-project-accounts.iam.gserviceaccount.com>
Reviewed-by: Ian Cottrell <iancottrell@google.com>
TryBot-Result: Gopher Robot <gobot@golang.org>

internal/sarif/sarif.go

@@ -36,9 +36,6 @@ type Run struct {
 	// Results contain govulncheck findings. There should be exactly one
 	// Result per a detected OSV.
 	Results []Result `json:"results,omitempty"`
-
-	// URIBaseIDs encodes the SARIF originalUriBaseIds property
-	URIBaseIDs map[string]ArtifactLocation `json:"originalUriBaseIds,omitempty"`
 }
 
 // Tool captures information about govulncheck analysis that was run.