fix(client-opsworks): intermittent integ tests failures

[trivikr]

Issue

Internal JS-2867
Refs: aws/aws-sdk-js#3839

Description

Explicitly setting region for OpsWorks integration tests, as they're failing intermittently.

Testing

Integration test for OpsWorks is successful

$ yarn test:integration-legacy -t @opsworks
yarn run v1.22.11
$ cucumber-js --fail-fast -t @opsworks
..................

2 scenarios (2 passed)
14 steps (14 passed)
0m01.326s
Done in 4.93s.

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[codecov-commenter]

Codecov Report

Merging #2865 (e3dcc9c) into main (95c2903) will not change coverage.
The diff coverage is n/a.

@@           Coverage Diff           @@
##             main    #2865   +/-   ##
=======================================
  Coverage   60.42%   60.42%           
=======================================
  Files         554      554           
  Lines       28886    28886           
  Branches     7072     7072           
=======================================
  Hits        17453    17453           
  Misses      11433    11433           

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[github-actions]

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