test(credential-provider-imds): abort nock pending requests in timeout check

[trivikr]

Issue

Refs: #4827

Description

Aborts nock pending requests when testing timeout

Testing

Before

$ yarn test --detectOpenHandles
...
Jest has detected the following 1 open handle potentially keeping Jest from exiting:

  ●  Timeout

       8 | export function httpRequest(options: RequestOptions): Promise<Buffer> {
       9 |   return new Promise((resolve, reject) => {
    > 10 |     const req = request({
         |                        ^
      11 |       method: "GET",
      12 |       ...options,
      13 |       // Node.js http module doesn't accept hostname with square brackets

      at new InterceptedRequestRouter (../../node_modules/nock/lib/intercepted_request_router.js:78:13)
      at new OverriddenClientRequest (../../node_modules/nock/lib/intercept.js:286:25)
      at ../../node_modules/nock/lib/intercept.js:423:14
      at module.request (../../node_modules/nock/lib/common.js:96:14)
      at src/remoteProvider/httpRequest.ts:10:24
      at httpRequest (src/remoteProvider/httpRequest.ts:9:10)
      at src/remoteProvider/httpRequest.spec.ts:112:29
      at src/remoteProvider/httpRequest.spec.ts:31:71
      at Object.<anonymous>.__awaiter (src/remoteProvider/httpRequest.spec.ts:27:12)
      at Object.<anonymous> (src/remoteProvider/httpRequest.spec.ts:105:28)

After

$ yarn test --detectOpenHandles
...
Test Suites: 11 passed, 11 total
Tests:       75 passed, 75 total
Snapshots:   0 total
Time:        4.455 s
Ran all test suites.
✨  Done in 5.08s.

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