fix(cli): assume role calls are skipping the proxy

[otaviomacedo]

STSClientConfig and NodeHttpHandlerOptions are different types, but all have optional properties only. That means that a call like this:

const credentials = await fromTemporaryCredentials({
  masterCredentials: mainCredentials.credentials,
  params: {
    RoleArn: roleArn,
    ExternalId: externalId,
    RoleSessionName: `aws-cdk-${safeUsername()}`,
    ...additionalOptions,
    TransitiveTagKeys: additionalOptions?.Tags ? additionalOptions.Tags.map((t) => t.Key!) : undefined,
  },
  clientConfig: {
    region,
    ...this.requestHandler, // type NodeHttpHandlerOptions
  },
})();

compiles just fine, when the intention was to write:

fromTemporaryCredentials({
  ...
  clientConfig: {
    region,
    requestHandler: this.requestHandler, // type NodeHttpHandlerOptions
  },
});

---

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[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 77.46%. Comparing base (deeb2ad) to head (60d6cbe).
Report is 1 commits behind head on main.

Additional details and impacted files

@@           Coverage Diff           @@
##             main   #32291   +/-   ##
=======================================
  Coverage   77.46%   77.46%           
=======================================
  Files         105      105           
  Lines        7168     7168           
  Branches     1314     1314           
=======================================
  Hits         5553     5553           
  Misses       1433     1433           
  Partials      182      182           

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AWS CodeBuild CI Report

• CodeBuild project: AutoBuildv2Project1C6BFA3F-wQm2hXv2jqQv
• Commit ID: 60d6cbe
• Result: SUCCEEDED
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