Fix flaky runtime and transport sync test waits

[tnotheis]

What changed

• Replaced the fixed 15-iteration polling limit in the runtime test sync helpers with a 10s timeout budget.
• Replaced the fixed 20-iteration polling limit in the transport test sync helper with a 60s timeout budget.
• Capped per-iteration sleeps so tests stay responsive while giving Loki/MongoDB/Backbone event propagation enough time under CI load.
• Included the timeout budget in thrown errors to make future sync wait failures easier to diagnose.

Why

The failing test-runtime-loki job timed out while waiting for identity-deletion peer events. When the cleanup hook timed out, later message tests inherited stale peer deletion state and failed with error.runtime.messages.peerIsInDeletion.

The same workflow run also had test-transport-mongodb failures in packages/transport/test/testHelpers/TestUtil.ts, where relationship reactivation tests hit syncUntil condition was not met. That helper had a separate fixed iteration budget, so this PR applies the same timeout-budget approach there too.

Validation

• npm run build:node
• USE_LOKIJS=true npx jest -i test/transport/identityDeletionPeerProcessing.test.ts test/transport/messages.test.ts passed identityDeletionPeerProcessing; the full local run hit an unrelated local Backbone recipient-limit failure in Messaging > send a Message to multiple recipients (count max 1 locally).
• USE_LOKIJS=true npx jest -i test/transport/messages.test.ts -t 'Message errors for peers that are in deletion|Postponed Notifications for cancelled Identity deletion|Mark Message as un-/read|Message query'
• npx prettier --check packages/runtime/test/lib/testUtils.ts
• npx prettier --check packages/transport/test/testHelpers/TestUtil.ts
• git diff --check

Notes:

• npm run lint:tsc --workspace=@nmshd/runtime currently fails locally on existing dependency declaration issues in node_modules plus test/lib/AdminApiClient.ts, unrelated to this change.
• npm run lint:tsc --workspace=@nmshd/transport currently fails locally on existing Loki declaration globals plus test/testHelpers/AdminApiClient.ts, unrelated to this change.
• I could not rerun the Docker-backed local transport MongoDB Jest target after this second commit because the local sandbox was denied access to the Docker API socket, even after requesting filesystem access to the socket.

[tnotheis]

@britsta @Milena-Czierlinski I asked Codex to fix the flaky tests. This is what it suggested. I'd say we merge it to main to see if it helps. The changes are not that absurd.

[britsta]

It would be great if that helped 🙏