fix(ec2-metadata-service): preserve statusCode when rethrowing errors for IMDS requests

[siddsriv]

Issue

#7357

Description

Bubbles up status code for users to access in case of errors when making an IMDS request().

Testing

Minimal repro:

import { MetadataService } from '@aws-sdk/ec2-metadata-service';

try {
    const metaService = new MetadataService({});
    await metaService.request(`/latest/meta-data/DNE`, {});
} catch (e) {
    console.log(e.statusCode)
    console.log(e.message)
}

Before the fix:

undefined
Error making request to the metadata service: Error: Request failed with status code 404

After the fix:

404
Error making request to the metadata service: Error: Request failed with status code 404

Unit tests in the package are passing.

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[siddsriv]

Canonical PR (upstream) for this fix here: #7564. Closing this one.