fix: Remove default value handling

[vam-google]

This is done in favor of explicit optional field handling in the generator.

[codecov]

Codecov Report

Merging #1353 (a61c6f3) into master (52e39f8) will decrease coverage by 0.06%.
The diff coverage is n/a.

❗ Current head a61c6f3 differs from pull request most recent head a197843. Consider uploading reports for the commit a197843 to get more accurate results

@@             Coverage Diff              @@
##             master    #1353      +/-   ##
============================================
- Coverage     81.46%   81.40%   -0.07%     
+ Complexity     1347     1340       -7     
============================================
  Files           211      211              
  Lines          5730     5721       -9     
  Branches        525      523       -2     
============================================
- Hits           4668     4657      -11     
- Misses          850      851       +1     
- Partials        212      213       +1     

Impacted Files	Coverage Δ	Complexity Δ
...m/google/api/gax/httpjson/ProtoRestSerializer.java	90.00% <ø> (-3.11%)	8.00 <0.00> (-6.00)
.../java/com/google/api/gax/batching/BatcherImpl.java	94.94% <0.00%> (-1.13%)	22.00% <0.00%> (-1.00%)
.../google/api/gax/batching/NonBlockingSemaphore.java	81.57% <0.00%> (ø)	12.00% <0.00%> (ø%)

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