chore: remove unused world.response from integ tests

[trivikr]

Issue #, if available:
N/A

Description of changes:

• remove unused world.response from integ tests
• integ tests now use values from this.data.$metadata
• verified that integ tests are successful

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

[codecov-io]

Codecov Report

Merging #1091 into master will increase coverage by 0.00%.
The diff coverage is 86.66%.

@@           Coverage Diff           @@
##           master    #1091   +/-   ##
=======================================
  Coverage   78.79%   78.79%           
=======================================
  Files         279      279           
  Lines       11598    11599    +1     
  Branches     2402     2402           
=======================================
+ Hits         9139     9140    +1     
  Misses       2459     2459           

Impacted Files	Coverage Δ
...ode/src/fixtures/MockEventMessageSource.fixture.ts	86.36% <0.00%> (ø)
packages/node-http-handler/src/server.mock.ts	76.66% <50.00%> (ø)
packages/hash-stream-node/src/index.ts	90.00% <100.00%> (ø)
packages/middleware-signing/src/middleware.ts	84.37% <100.00%> (ø)
...es/node-http-handler/src/set-connection-timeout.ts	38.46% <100.00%> (ø)
...ckages/node-http-handler/src/set-socket-timeout.ts	100.00% <100.00%> (ø)
packages/signature-v4/src/SignatureV4.ts	100.00% <100.00%> (ø)
packages/smithy-client/src/lazy-json.ts	100.00% <100.00%> (ø)
packages/smithy-client/src/split-every.ts	100.00% <100.00%> (ø)
packages/stream-collector-node/src/index.ts	100.00% <100.00%> (ø)
... and 2 more

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[aws-sdk-js-automation]

AWS CodeBuild CI Report

• CodeBuild project: sdk-staging-test
• Commit ID: 14a87e3
• Result: SUCCEEDED
• Build Logs (available for 30 days)

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