fix(e2e): delete cognitoidentity resources in After call

[trivikr]

Issue

Refs: #3948

Description

Moves deletion of cognitoidentity resources in After call

Testing

No easy way to simulate failed test. The After call was tested in #3948

Success case

$ aws cognito-identity list-identity-pools --max-results 50 | jq '.IdentityPools[].IdentityPoolName | select(startswith("awssdkjs"))'

$ yarn run cucumber-js --fail-fast -t @cognitoidentity
yarn run v1.22.19
$ /local/home/trivikr/workspace/aws-sdk-js-v3/node_modules/.bin/cucumber-js --fail-fast -t @cognitoidentity
...........

2 scenarios (2 passed)
5 steps (5 passed)
0m00.246s (executing steps: 0m00.213s)
Done in 1.08s.

$ aws cognito-identity list-identity-pools --max-results 50 | jq '.IdentityPools[].IdentityPoolName | select(startswith("awssdkjs"))'

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