Co-authored-by: Copilot Autofix powered by AI <175728472+Copilot@users.noreply.github.com>

The test started the pipeline in a goroutine and never stopped it, so it
kept writing metadata into the data dir while t.TempDir() cleanup was
removing it:

  --- FAIL: TestHealthEndpoint/API_OFF
      TempDir RemoveAll cleanup: unlinkat /tmp/...: directory not empty

There was no way to stop it: runConduitCmdWithConfig hardcoded
context.Background(). Take a context instead, which MakePipeline already
derives its cancelable context from, and have the test cancel and wait
for the goroutine to finish before returning. The cobra command passes
cmd.Context(), which cobra defaults to context.Background(), so the
binary behaves as before.

Nightly algod now produces transactions signed with post-quantum
signatures. idb.SignatureType in the pinned indexer only knew
sig/msig/lsig, so the postgresql exporter aborted the round:

  AddBlock() err: getSigTypeDelta() err: unable to determine the
  signature type for stxn=&{... PQsig:{Scheme:[102 49] ...}}

Indexer main handles this as of 219b2118 ("Update to recognize
pqsigs"). It pins the same go-algorand-sdk revision we already use, so
this bump touches nothing else.