test(apollo-client): make timeout more longer when long poll

[Anilople]

What's the purpose of this PR

Fix test failed on some environment.

Which issue(s) this PR fixes:

Fixes #3369

Brief changelog

Add timeout.

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• Read the Contributing Guide before making this pull request.
• Write a pull request description that is detailed enough to understand what the pull request does, how, and why.
• Write necessary unit tests to verify the code.
• Run mvn clean test to make sure this pull request doesn't break anything.

[codecov-commenter]

Codecov Report

Merging #3668 (82508bd) into master (21ac89c) will decrease coverage by 0.00%.
The diff coverage is n/a.

@@             Coverage Diff              @@
##             master    #3668      +/-   ##
============================================
- Coverage     50.94%   50.93%   -0.01%     
+ Complexity     2329     2328       -1     
============================================
  Files           449      449              
  Lines         14026    14026              
  Branches       1426     1426              
============================================
- Hits           7145     7144       -1     
  Misses         6395     6395              
- Partials        486      487       +1     

Impacted Files	Coverage Δ	Complexity Δ
.../apollo/internals/RemoteConfigLongPollService.java	77.71% <0.00%> (-0.61%)	28.00% <0.00%> (-1.00%)

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[nobodyiam]

LGTM