fix(abort-controller): make AbortSignal WHATWG Spec compliant

[trivikr]

Issue #, if available:
Fixes: #1159

Description of changes:
Makes AbortSignal WHATWG Spec compliant.

Verified that no errors were thrown with the following code:

const { DynamoDBClient, ListTablesCommand } = require("@aws-sdk/client-dynamodb");

// Commenting the import verifies the fix with AbortController Web API.
// Uncommenting the import verifies the fix with abort-controller npm package.
// const { AbortController } = require("abort-controller");

const abortSignal = new AbortController().signal;
const client = new DynamoDBClient({});

client.send(
  new ListTablesCommand({}),
  { abortSignal }
);

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

[alexforsyth]

LGTM, after build passes

[codecov-io]

Codecov Report

Merging #1699 (e238aee) into master (de75f7e) will decrease coverage by 0.01%.
The diff coverage is n/a.

@@            Coverage Diff             @@
##           master    #1699      +/-   ##
==========================================
- Coverage   79.77%   79.76%   -0.02%     
==========================================
  Files         325      329       +4     
  Lines       12087    12574     +487     
  Branches     2553     2671     +118     
==========================================
+ Hits         9643    10030     +387     
- Misses       2444     2544     +100     

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 109 more

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