Refactor api.ts file constants to getters

[hlshen]

Description

Scenarios Tested

Sample Commands

[codecov-commenter]

Codecov Report

Attention: Patch coverage is 78.91566% with 35 lines in your changes are missing coverage. Please review.

Project coverage is 54.44%. Comparing base (c6d1615) to head (6dc1c67).

Files	Patch %	Lines
src/api.ts	91.74%	8 Missing and 1 partial ⚠️
src/gcp/storage.ts	0.00%	7 Missing ⚠️
src/auth.ts	0.00%	5 Missing ⚠️
src/extensions/extensionsHelper.ts	25.00%	3 Missing ⚠️
src/deploy/functions/containerCleaner.ts	33.33%	2 Missing ⚠️
src/deploy/functions/build.ts	0.00%	1 Missing ⚠️
src/deploy/functions/prepare.ts	0.00%	1 Missing ⚠️
src/deploy/index.ts	0.00%	1 Missing ⚠️
src/extensions/resolveSource.ts	0.00%	1 Missing ⚠️
src/extensions/secretsUtils.ts	0.00%	1 Missing ⚠️
... and 4 more

Additional details and impacted files

@@            Coverage Diff             @@
##           master    #6913      +/-   ##
==========================================
+ Coverage   54.37%   54.44%   +0.07%     
==========================================
  Files         353      353              
  Lines       24602    24652      +50     
  Branches     5094     5094              
==========================================
+ Hits        13378    13423      +45     
- Misses      10006    10012       +6     
+ Partials     1218     1217       -1     

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