Fix health-metrics

[paulb777]

Downversion to actions/upload-artifact@v3

The new upload-artifact version from #12337 broke the health metrics presubmit job - https://github.com/firebase/firebase-ios-sdk/actions/runs/7748205614/job/21130380583

With the provided path, there will be 41 files uploaded
Artifact name is valid!
Root directory input is valid!
Error: Failed to CreateArtifact: Received non-retryable error: Failed request: (409) Conflict: an artifact with this name already exists on the workflow run

The failures are related to actions/upload-artifact#478. We need a resolution before going to actions/upload-artifact@v4

[google-oss-bot]

Coverage Report ¹

Affected Products

• FirebaseDynamicLinks-iOS-FirebaseDynamicLinks.framework

  Overall coverage changed from ? (true) to 61.52% (d5b21be) by ?.

  15 individual files with coverage change

  Filename	Base (true)	Merge (d5b21be)	Diff
  FDLDeviceHeuristicsHelper.m	?	0.00%	?
  FDLLogging.m	?	58.62%	?
  FDLURLComponents.m	?	82.31%	?
  FDLUtilities.m	?	75.40%	?
  FIRDLDefaultRetrievalProcessV2.m	?	14.04%	?
  FIRDLJavaScriptExecutor.m	?	24.81%	?
  FIRDLRetrievalProcessFactory.m	?	100.00%	?
  FIRDLRetrievalProcessResult.m	?	100.00%	?
  FIRDLScionLogging.m	?	100.00%	?
  FIRDynamicLink.m	?	74.07%	?
  FIRDynamicLinkComponentsKeyProvider.m	?	83.33%	?
  FIRDynamicLinkNetworking.m	?	45.09%	?
  FIRDynamicLinks.m	?	71.30%	?
  GINArgument.m	?	0.00%	?
  GINInvocation.m	?	0.00%	?

Test Logs

• Merge (d5b21be): https://github.com/firebase/firebase-ios-sdk/actions/runs/7748856652

1. https://storage.googleapis.com/firebase-sdk-metric-reports/xJqrtTUY2W.html