fix: do not modify options object, use defaultScopes

[alexander-fenster]

Regenerated the library using
gapic-generator-typescript
v1.2.1.

[generated-files-bot]

Warning: This pull request is touching the following templated files:

• src/v2/config_service_v2_client.ts
• src/v2/logging_service_v2_client.ts
• src/v2/metrics_service_v2_client.ts
• system-test/install.ts

[codecov]

Codecov Report

Merging #935 (1c5e686) into master (e594c9b) will decrease coverage by 0.03%.
The diff coverage is 98.25%.

@@            Coverage Diff             @@
##           master     #935      +/-   ##
==========================================
- Coverage   98.24%   98.21%   -0.04%     
==========================================
  Files          18       18              
  Lines       10843    10928      +85     
  Branches      378      367      -11     
==========================================
+ Hits        10653    10733      +80     
- Misses        188      193       +5     
  Partials        2        2              

Impacted Files	Coverage Δ
src/v2/metrics_service_v2_client.ts	98.37% <96.47%> (-0.04%)	⬇️
src/v2/logging_service_v2_client.ts	98.51% <98.49%> (-0.09%)	⬇️
src/v2/config_service_v2_client.ts	98.70% <98.90%> (-0.05%)	⬇️

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