chore: remove unused configuration from integ tests

[trivikr]

Issue #, if available:
Was noticed while investigating #1338

Description of changes:

The environment variable CONFIGURED_REGION is used in v2 for setting up global AWS config, and it's not required in v3 integ tests

• v2 code which sets env var CONFIGURED_REGION https://github.com/aws/aws-sdk-js/blob/cc29728c1c4178969ebabe3bbe6b6f3159436394/features/extra/world.js#L8
• v2 code which uses env var CONFIGURED_REGION https://github.com/aws/aws-sdk-js/blob/cc29728c1c4178969ebabe3bbe6b6f3159436394/features/extra/cleanup.js#L106-L108
• In v3, the region is explicitly set where required during client creation
  • Explicitly in JavaScript

    aws-sdk-js-v3/features/inspector/step_definitions/inspector.js

    Lines 4 to 7 in 4bc605b

    	Before({ tags: "@inspector" }, function (scenario, callback) {
    	this.service = new Inspector({ region: "us-west-2" });
    	callback();
    	});

  • In scenario

    aws-sdk-js-v3/features/s3/buckets.feature

    Line 13 in c96f35f

    Given I am using the S3 "us-west-2" region

The file configuration:

• is used in v2 integ tests
  • Defined at https://github.com/aws/aws-sdk-js/blob/cc29728c1c4178969ebabe3bbe6b6f3159436394/configuration.sample
  • Consumed in https://github.com/aws/aws-sdk-js/blob/cc29728c1c4178969ebabe3bbe6b6f3159436394/features/extra/world.js#L6
• In v3, the file was removed in chore: remove unused configuration.sample #1088

Verified that integration tests are successful

$ yarn test:integration-legacy
yarn run v1.22.4
$ cucumber-js --fail-fast
.................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................

153 scenarios (153 passed)
534 steps (534 passed)
1m00.378s

By submitting this pull request, I confirm that you can use, modify, copy, and redistribute this contribution, under the terms of your choice.

[codecov-commenter]

Codecov Report

Merging #1339 into master will increase coverage by 0.00%.
The diff coverage is 100.00%.

@@           Coverage Diff           @@
##           master    #1339   +/-   ##
=======================================
  Coverage   77.67%   77.67%           
=======================================
  Files         286      287    +1     
  Lines       11955    11970   +15     
  Branches     2623     2626    +3     
=======================================
+ Hits         9286     9298   +12     
- Misses       2669     2672    +3     

Impacted Files	Coverage Δ
.../middleware-sdk-transcribe-streaming/src/signer.ts	80.00% <100.00%> (ø)

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[alexforsyth]

LGTM +1

[github-actions]

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