chore(client-cognito-identity): remove auth customizations

[trivikr]

Issue #, if available:
Refs: aws/aws-sdk-js#3543

Description of changes:
The customization is no longer required as smithy optionalAuth was added to respective APIs in 11/20 models update.

• PR: feat: update clients as of 11/20/2020 #1711
• Code:

  aws-sdk-js-v3/codegen/sdk-codegen/aws-models/cognito-identity.2014-06-30.json

  Line 760 in fdc692e

  "smithy.api#optionalAuth": {}

Verified that running codegen doesn't update the client-cognito-identity:

$ yarn generate-clients -g codegen/sdk-codegen/aws-models/cognito-identity.2014-06-30.json

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 #1733 (b93d259) into master (de75f7e) will decrease coverage by 0.00%.
The diff coverage is n/a.

@@            Coverage Diff             @@
##           master    #1733      +/-   ##
==========================================
- Coverage   79.77%   79.77%   -0.01%     
==========================================
  Files         325      329       +4     
  Lines       12087    12583     +496     
  Branches     2553     2675     +122     
==========================================
+ Hits         9643    10038     +395     
- Misses       2444     2545     +101     

Impacted Files	Coverage Δ
...tocol_tests/aws-restxml/commands/XmlMapsCommand.ts	95.65% <0.00%> (-4.35%)	⬇️
...ocol_tests/aws-restxml/commands/XmlBlobsCommand.ts	95.65% <0.00%> (-4.35%)	⬇️
...ocol_tests/aws-restxml/commands/XmlEnumsCommand.ts	95.65% <0.00%> (-4.35%)	⬇️
...ocol_tests/aws-restxml/commands/XmlListsCommand.ts	95.65% <0.00%> (-4.35%)	⬇️
...col_tests/aws-restjson/commands/JsonMapsCommand.ts	95.65% <0.00%> (-4.35%)	⬇️
...ol_tests/aws-restjson/commands/JsonBlobsCommand.ts	95.65% <0.00%> (-4.35%)	⬇️
...ol_tests/aws-restjson/commands/JsonEnumsCommand.ts	95.65% <0.00%> (-4.35%)	⬇️
...ol_tests/aws-restjson/commands/JsonListsCommand.ts	95.65% <0.00%> (-4.35%)	⬇️
...tests/aws-restxml/commands/XmlAttributesCommand.ts	95.65% <0.00%> (-4.35%)	⬇️
...tests/aws-restxml/commands/XmlNamespacesCommand.ts	95.65% <0.00%> (-4.35%)	⬇️
... and 124 more

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