Remove redundant variables from ResponseMetadata

[trivikr]

Is your feature request related to a problem? Please describe.
ResponseMetadata may contain redundant variables (requestId, extendedRequestId and cfId) which are present in httpHeaders

aws-sdk-js-v3/packages/types/src/response.ts

Lines 14 to 28 in a377957

	/**
	* A unique identifier for the last request sent for this operation. Often
	* requested by AWS service teams to aid in debugging.
	*/
	requestId?: string;
	/**
	* A secondary identifier for the last request sent. Used for debugging.
	*/
	extendedRequestId?: string;
	/**
	* A tertiary identifier for the last request sent. Used for debugging.
	*/
	cfId?: string;

Findings:

• requestId is populated from x-amzn-requestid header which is accessible in httpHeaders

  aws-sdk-js-v3/clients/client-s3/protocols/Aws_restXml.ts

  Line 12832 in a377957

  requestId: output.headers["x-amzn-requestid"],

• extendedRequestId used to be populated from x-amz-id-2 header in 0.1.0-preview clients

  aws-sdk-js-v3/packages/response-metadata-extractor/src/index.ts

  Line 21 in 47f1c36

  extendedRequestId: httpHeaders[EXTENDED_REQUEST_ID_HEADER],

• cfId used to be populated from "x-amz-cf-id" header in 0.1.0-preview clients

  aws-sdk-js-v3/packages/response-metadata-extractor/src/index.ts

  Line 22 in 47f1c36

  cfId: httpHeaders[CF_ID_HEADER]

Describe the solution you'd like
Delete these redundant variables requestId, extendedRequestId and cfId

Additional context
This issue was cut while creating logger for v3

[trivikr]

The keys extendedRequestId and cfId are important for debugging and will be added in #1521

Post that, the httpHeaders will be removed from metadata in #1491

[github-actions]

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