Fix flaky test

[plzdoo]

The test testReleaseBuild in class ReleaseControllerTest is flakiness due to the indeterministic iteration order of HashMap used in line 104. Changing it to LinkedHashMap can solve the problem.

Using mvn -pl apollo-adminservice edu.illinois:nondex-maven-plugin:1.1.2:nondex test -Dtest=ReleaseControllerTest#testReleaseBuild -DnondexRuns=10 can reproduce the problem.

[github-actions]

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[plzdoo]

I have read the CLA Document and I hereby sign the CLA

[codecov-commenter]

Codecov Report

Merging #4311 (f514768) into master (a882f3e) will decrease coverage by 0.00%.
The diff coverage is n/a.

@@             Coverage Diff              @@
##             master    #4311      +/-   ##
============================================
- Coverage     53.17%   53.16%   -0.01%     
+ Complexity     2668     2667       -1     
============================================
  Files           488      488              
  Lines         15253    15253              
  Branches       1577     1577              
============================================
- Hits           8111     8110       -1     
  Misses         6587     6587              
- Partials        555      556       +1     

Impacted Files	Coverage Δ
...ervice/service/ReleaseMessageServiceWithCache.java	84.70% <0.00%> (-1.18%)	⬇️

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[nobodyiam]

LGTM