Fix storage gcs conformance tests

[tonyjhuang]

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Description

• Fixes remaining metadata bugs in https://github.com/firebase/firebase-tools/issues/3398#issuecomment-1159821364 by setting appropriate default metadata fields depending on which API is used
• Introduces media upload protocol support to both GCS and Firebase APIs
• Adds support to GCS API for /storage/v1/b/:bucketId/o/:objectId url pattern

Scenarios Tested

Sample Commands

[codecov-commenter]

Codecov Report

Merging #4869 (3f1f3cd) into master (5728643) will decrease coverage by 0.19%. The diff coverage is 4.29%.

@@            Coverage Diff             @@
##           master    #4869      +/-   ##
==========================================
- Coverage   56.93%   56.73%   -0.20%     
==========================================
  Files         288      288              
  Lines       19062    19110      +48     
  Branches     3775     3792      +17     
==========================================
- Hits        10853    10843      -10     
- Misses       7290     7350      +60     
+ Partials      919      917       -2     

Impacted Files	Coverage Δ
src/emulator/storage/apis/firebase.ts	4.05% <0.00%> (-0.04%)	:arrow_down:
src/emulator/storage/apis/gcloud.ts	5.33% <0.00%> (-1.09%)	:arrow_down:
src/emulator/storage/files.ts	23.75% <0.00%> (-1.15%)	:arrow_down:
src/emulator/storage/upload.ts	72.72% <33.33%> (-5.28%)	:arrow_down:
src/emulator/storage/metadata.ts	42.05% <71.42%> (-4.62%)	:arrow_down:

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