[alexander-fenster]

One consequence of #730 is that it will take up to date protos for IAM. Normally, this should not be an issue, but seems there was a slight change in the return value of setting IAM policy (added condition: null to the result). In this PR I'm updating the protos, the generated .d.ts files for IAM, and system/sample tests.

• Tests and linter pass
• Code coverage does not decrease (if any source code was changed)
• Appropriate docs were updated (if necessary)

[codecov]

Codecov Report

Merging #734 into master will not change coverage.
The diff coverage is n/a.

@@          Coverage Diff          @@
##           master   #734   +/-   ##
=====================================
  Coverage      97%    97%           
=====================================
  Files          14     14           
  Lines         867    867           
  Branches      182    182           
=====================================
  Hits          841    841           
  Misses          6      6           
  Partials       20     20

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