build: add distribution_name to .repo-metadata.json

[BenWhitehead]

No description provided.

[codecov]

Codecov Report

Merging #30 into master will decrease coverage by <.01%.
The diff coverage is n/a.

@@             Coverage Diff             @@
##             master     #30      +/-   ##
===========================================
- Coverage      0.51%   0.51%   -0.01%     
  Complexity       19      19              
===========================================
  Files             6       6              
  Lines         10868   10926      +58     
  Branches       2200    2200              
===========================================
  Hits             56      56              
- Misses        10809   10867      +58     
  Partials          3       3

Impacted Files	Coverage Δ	Complexity Δ
.../google/cloud/conformance/storage/v1/TestFile.java	0% <0%> (ø)	0% <0%> (ø)	⬇️
...cloud/conformance/firestore/v1/TestDefinition.java	0% <0%> (ø)	0% <0%> (ø)	⬇️
.../cloud/conformance/bigtable/v2/TestDefinition.java	0% <0%> (ø)	0% <0%> (ø)	⬇️

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