fix: Settings objects should not try to read quotaProjectId from credentials

[chingor13]

This is causing downstream errors in unit tests because the settings are attempting to load credentials while the settings are being built.

This is a behavioral change. The settings object should not care about what's in the credentials provider when being asked for its configured quotaProjectId. We now will only return an explicitly configured quotaProjectId. ClientContext.create will correctly determine the correct value to use.

[codecov]

Codecov Report

Merging #1162 into master will increase coverage by 0.01%.
The diff coverage is n/a.

@@             Coverage Diff              @@
##             master    #1162      +/-   ##
============================================
+ Coverage     78.97%   78.99%   +0.01%     
  Complexity     1194     1194              
============================================
  Files           205      205              
  Lines          5266     5260       -6     
  Branches        436      435       -1     
============================================
- Hits           4159     4155       -4     
+ Misses          935      933       -2     
  Partials        172      172              

Impacted Files	Coverage Δ	Complexity Δ
...main/java/com/google/api/gax/rpc/StubSettings.java	75.67% <ø> (+0.35%)	12.00 <0.00> (ø)

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[summer-ji-eng]

The downstream client lib test fails on get gax version (

gax-java/build.gradle

Line 45 in 2c56c79

ext.outputFile = file("gax/src/main/resources/dependencies.properties")

). Are we still consider to remove getting quota from credentials?

[chingor13]

Are we still consider to remove getting quota from credentials?

The change removes the settings objects asking the credentials for the quotaProjectId. The right headers should still be handled correctly for the requests.

[summer-ji-eng]

I expand this PR to hide header from setting as well see #1162

[summer-ji-eng]

@chingor13 I expand this PR to hide header from setting as well see #1162