fix: add clirr ignored diffs files

[hannahrogers-google]

I am ignoring the most common failures in the internal folders and the beam folder. I also added an ignored diffs file for our protos.

Fixes #178

[anguillanneuf]

Thank you! Samples tests fail because we hit a quota limit in us-central1-b. I can update test to not always pick the same zone when tests are run.

[codecov]

Codecov Report

Merging #184 into master will not change coverage.
The diff coverage is n/a.

@@            Coverage Diff            @@
##             master     #184   +/-   ##
=========================================
  Coverage     64.02%   64.02%           
  Complexity      650      650           
=========================================
  Files           133      133           
  Lines          3886     3886           
  Branches        198      198           
=========================================
  Hits           2488     2488           
  Misses         1287     1287           
  Partials        111      111           

Impacted Files	Coverage Δ	Complexity Δ
...c/main/java/com/google/cloud/pubsublite/Stubs.java	0.00% <ø> (ø)	0.00 <0.00> (ø)

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