[EngSys] Unified pipeline not adding labels some PRs

[mikeharder]

For some reason, the unified pipeline refuses to add labels to this PR:

#32805

Maybe this one as well:

#32811

[mikeharder]

This is a bug in the "Summary" step of the unified pipeline, where it doesn't handle a non-existing file reference from a spec.

error checking PR summary
{
  stack: 'ResolverError: Error reading file "/mnt/vss/_work/1/azure-rest-api-specs/common-types/resource-management/v4/types.json"\n' +
    '    at onError (/mnt/vss/_work/1/a/unified-pipeline-runtime/common/temp/node_modules/.pnpm/@[email protected]/node_modules/@apidevtools/json-schema-ref-parser/lib/parse.js:92:16)\n' +
    '    at process.processTicksAndRejections (node:internal/process/task_queues:95:5)',

https://dev.azure.com/azure-sdk/internal/_build/results?buildId=4598592&view=logs&j=d6a48a56-e996-55ca-2302-c3a9a7be685b&t=f4162ac4-a5be-580e-39db-db0d6209bd6a&l=56

However, fixing this is a low priority, since the next step is to fix the spec regardless of the failure reason.