Stop flooding Swift Package Manager projects with Firebase test schemes

[paulb777]

Fix #8167

Move SPM test schemes into place only for CI and internal development. Additional context at https://forums.swift.org/t/swiftpm-and-library-unit-testing/26255/21

Also, updated schemes with enabling analyzer to mitigate conflicts with in-flight #8208, #8209, and #8210

[google-oss-bot]

Coverage Report

Affected SDKs

• FirebaseDatabase-iOS-FirebaseDatabase.framework

  SDK overall coverage changed from 56.95% (85ca3cb) to 57.10% (3d46ec8) by +0.15%.

  Filename	Base (85ca3cb)	Head (3d46ec8)	Diff
  FSRWebSocket.m	39.95%	41.78%	+1.83%

• FirebaseDynamicLinks-iOS-FirebaseDynamicLinks.framework

  SDK overall coverage changed from 75.57% (85ca3cb) to 57.21% (3d46ec8) by -18.36%.

  Filename	Base (85ca3cb)	Head (3d46ec8)	Diff
  FDLUtilities.m	90.15%	73.48%	-16.67%
  FIRDLDefaultRetrievalProcessV2.m	72.92%	0.00%	-72.92%
  FIRDLJavaScriptExecutor.m	82.48%	0.00%	-82.48%
  FIRDLRetrievalProcessFactory.m	100.00%	0.00%	-100.00%
  FIRDynamicLinkNetworking.m	80.83%	44.44%	-36.39%
  FIRDynamicLinks.m	69.84%	67.94%	-1.90%

• FirebaseFirestore-iOS-FirebaseFirestore.framework

  SDK overall coverage changed from 88.44% (85ca3cb) to 88.47% (3d46ec8) by +0.03%.

  Filename	Base (85ca3cb)	Head (3d46ec8)	Diff
  exception.cc	25.00%	77.08%	+52.08%
  exception_apple.mm	89.66%	58.62%	-31.03%
  leveldb_key.cc	97.81%	96.79%	-1.02%
  task.cc	96.41%	95.21%	-1.20%

Test Logs

• Base (85ca3cb2): https://github.com/firebase/firebase-ios-sdk/actions/runs/916554882
• Head (3d46ec87): https://github.com/firebase/firebase-ios-sdk/actions/runs/916804245

[maksymmalyhin]

LGTM, nice clean up, thank you!

[maksymmalyhin]

I'm afraid I will miss this step all the time in the future 😄

[paulb777]

Yep, it's annoying, but as far as I can tell worth it because of the product advantages for clients. 😛