fix: remove eslint, update gax, fix generated protos, run the generator

[alexander-fenster]

Run the latest version of the generator, update google-gax, update gts, and remove direct dependencies on eslint.

[codecov]

Codecov Report

Merging #955 into master will decrease coverage by 0.03%.
The diff coverage is 94.87%.

@@            Coverage Diff             @@
##           master     #955      +/-   ##
==========================================
- Coverage   94.08%   94.04%   -0.04%     
==========================================
  Files          23       23              
  Lines       10662    10659       -3     
  Branches      522      503      -19     
==========================================
- Hits        10031    10024       -7     
- Misses        628      632       +4     
  Partials        3        3              

Impacted Files	Coverage Δ
src/lease-manager.ts	100.00% <ø> (ø)
src/subscriber.ts	99.78% <ø> (-0.01%)	⬇️
src/helper.ts	64.50% <66.66%> (-0.12%)	⬇️
src/index.ts	95.54% <66.66%> (-0.67%)	⬇️
src/message-queues.ts	99.59% <100.00%> (+<0.01%)	⬆️
src/message-stream.ts	98.21% <100.00%> (-0.51%)	⬇️
src/publisher/index.ts	58.87% <100.00%> (ø)
src/publisher/message-queues.ts	50.00% <100.00%> (ø)
src/publisher/publish-error.ts	44.00% <100.00%> (+0.75%)	⬆️
src/pubsub.ts	99.50% <100.00%> (+<0.01%)	⬆️
... and 7 more

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[gcf-merge-on-green]

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