fix: return operation array from getOperation method

[xiaozhenliu-gg5]

related: googleapis/gapic-generator-typescript#420

[codecov]

Codecov Report

Merging #816 into master will increase coverage by 0.04%.
The diff coverage is 100.00%.

@@            Coverage Diff             @@
##           master     #816      +/-   ##
==========================================
+ Coverage   89.95%   90.00%   +0.04%     
==========================================
  Files          48       48              
  Lines        8133     8133              
  Branches      479      480       +1     
==========================================
+ Hits         7316     7320       +4     
+ Misses        814      810       -4     
  Partials        3        3              

Impacted Files	Coverage Δ
src/operationsClient.ts	89.73% <100.00%> (ø)
.mocharc.js	78.57% <0.00%> (-14.29%)	⬇️
src/normalCalls/retries.ts	98.71% <0.00%> (+5.12%)	⬆️

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