test(efs): check for ValidationException

[trivikr]

Issue #, if available:
Refs: aws/aws-sdk-js#3321

Description of changes:
EFS started throwing ValidationException instead of BadRequest for deleteFileSystem operation on Saturday 06/20

Updating the tests after verifying that ValidationException is thrown also on AWS CLI:

$ date
Mon Jun 22 09:42:00 PDT 2020

$ aws --version
aws-cli/1.16.226 Python/3.7.3 Darwin/18.7.0 botocore/1.12.216

$ aws efs delete-file-system --file-system-id fake-id

An error occurred (ValidationException) when calling the DeleteFileSystem operation: 1 validation error detected: Value 'fake-id' at 'fileSystemId' failed to satisfy constraint: Member must satisfy regular expression pattern: ^fs-[0-9a-f]{8,40}

Ensured that integration tests are successful for EFS:

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

2 scenarios (2 passed)
5 steps (5 passed)
0m00.143s
Done in 2.49s.

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 #1288 into master will increase coverage by 0.10%.
The diff coverage is n/a.

@@            Coverage Diff             @@
##           master    #1288      +/-   ##
==========================================
+ Coverage   73.04%   73.15%   +0.10%     
==========================================
  Files         287      290       +3     
  Lines       12730    12780      +50     
  Branches     2922     2933      +11     
==========================================
+ Hits         9299     9349      +50     
  Misses       3431     3431              

Impacted Files	Coverage Δ
clients/client-s3/S3Client.ts	94.11% <0.00%> (ø)
clients/client-s3/runtimeConfig.ts	100.00% <0.00%> (ø)
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)
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)
... and 8 more

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[alexforsyth]

Nice, LGTM!

[github-actions]

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