better handle failed requests when listing functions for backends

[bkendall]

Description

The check that was added to catch permissions issues had a little problem and the status wasn't being properly passed through and checked. This CL fixes both and adds additional tests.

Scenarios Tested

Deploying with the cloud functions API turned off when including rewrite functions works correctly.

Fixes #5071.

Hopefully for real.

[codecov-commenter]

Codecov Report

Base: 56.01% // Head: 56.09% // Increases project coverage by +0.07% 🎉

Coverage data is based on head (a41eaa6) compared to base (3a9d1c3).
Patch coverage: 0.00% of modified lines in pull request are covered.

Additional details and impacted files

@@            Coverage Diff             @@
##           master    #5111      +/-   ##
==========================================
+ Coverage   56.01%   56.09%   +0.07%     
==========================================
  Files         308      308              
  Lines       20699    20700       +1     
  Branches     4187     4188       +1     
==========================================
+ Hits        11594    11611      +17     
+ Misses       8102     8082      -20     
- Partials     1003     1007       +4     

Impacted Files	Coverage Δ
src/deploy/hosting/convertConfig.ts	69.90% <0.00%> (+0.97%)	⬆️
src/gcp/cloudfunctions.ts	69.18% <0.00%> (+2.88%)	⬆️
src/emulator/auth/state.ts	85.43% <0.00%> (+0.56%)	⬆️
src/gcp/cloudfunctionsv2.ts	62.10% <0.00%> (+4.21%)	⬆️

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[inlined]

I might have modified the v2 codebase to also log & wrap if necessary, but I understand making minimal changes after freeze.