feat: automatically use service and revision name in Knative environments

[DominicKramer]

Fixes #370

[codecov]

Codecov Report

Merging #375 into master will increase coverage by 0.37%.
The diff coverage is 100%.

@@            Coverage Diff             @@
##           master     #375      +/-   ##
==========================================
+ Coverage   92.19%   92.57%   +0.37%     
==========================================
  Files          21       21              
  Lines        3140     3151      +11     
  Branches      328      327       -1     
==========================================
+ Hits         2895     2917      +22     
+ Misses        241      230      -11     
  Partials        4        4

Impacted Files	Coverage Δ
src/configuration.ts	94.58% <100%> (+0.12%)	⬆️
src/google-apis/auth-client.ts	96.66% <0%> (+4.58%)	⬆️

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