test: using existing resources in e2e tests

[AllanZhengYP]

Instead of creating resources(IAM, Identity pools) every time when e2e test suites run, we will call existing resources fixed in test account. This way we achieve low coupling with the test.

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[codecov-commenter]

Codecov Report

Merging #1320 into master will increase coverage by 4.44%.
The diff coverage is n/a.

@@            Coverage Diff             @@
##           master    #1320      +/-   ##
==========================================
+ Coverage   73.04%   77.49%   +4.44%     
==========================================
  Files         287      286       -1     
  Lines       12730    11898     -832     
  Branches     2922     2601     -321     
==========================================
- Hits         9299     9220      -79     
+ Misses       3431     2678     -753     

Impacted Files	Coverage Δ
packages/region-provider/src/fromEnv.ts	100.00% <0.00%> (ø)
protocol_tests/aws-ec2/runtimeConfig.ts	100.00% <0.00%> (ø)
protocol_tests/aws-json/runtimeConfig.ts	100.00% <0.00%> (ø)
packages/property-provider/src/memoize.ts	100.00% <0.00%> (ø)
protocol_tests/aws-query/runtimeConfig.ts	100.00% <0.00%> (ø)
protocol_tests/aws-ec2/EC2ProtocolClient.ts	92.30% <0.00%> (ø)
protocol_tests/aws-restxml/runtimeConfig.ts	100.00% <0.00%> (ø)
protocol_tests/aws-restjson/runtimeConfig.ts	100.00% <0.00%> (ø)
protocol_tests/aws-json/JsonProtocolClient.ts	92.30% <0.00%> (ø)
packages/middleware-retry/src/configurations.ts	100.00% <0.00%> (ø)
... and 15 more

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