feat(credential-provider-imds): signed IMDS workflow

[trivikr]

Issue #, if available:
Internal JS-1903

Description of changes:
signed IMDS workflow

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

[codecov-commenter]

Codecov Report

Merging #1358 into master will increase coverage by 0.07%.
The diff coverage is 97.59%.

@@            Coverage Diff             @@
##           master    #1358      +/-   ##
==========================================
+ Coverage   79.00%   79.07%   +0.07%     
==========================================
  Files         287      287              
  Lines       11112    11150      +38     
  Branches     2350     2358       +8     
==========================================
+ Hits         8779     8817      +38     
  Misses       2333     2333              

Impacted Files	Coverage Δ
packages/abort-controller/src/AbortController.ts	100.00% <ø> (ø)
packages/abort-controller/src/AbortSignal.ts	100.00% <ø> (ø)
...-provider-cognito-identity/src/IndexedDbStorage.ts	19.14% <0.00%> (ø)
...ges/eventstream-marshaller/src/HeaderMarshaller.ts	100.00% <ø> (ø)
.../eventstream-marshaller/src/TestVectors.fixture.ts	100.00% <ø> (ø)
...sal/src/fixtures/MockEventMessageSource.fixture.ts	86.95% <ø> (ø)
...tream-serde-universal/src/getUnmarshalledStream.ts	80.76% <ø> (ø)
packages/hash-blob-browser/src/index.ts	100.00% <ø> (ø)
packages/middleware-header-default/src/index.ts	90.90% <ø> (ø)
packages/middleware-host-header/src/index.ts	80.00% <ø> (ø)
... and 87 more

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[AllanZhengYP]

Looks good to me!

[trivikr]

Converted to draft, as it would need rebase after lint PR is merged #1367

[trivikr]

Moved to ready for review, as it's rebased form master, linted and conflicts resolved.

[AllanZhengYP]

Re-approve.

[github-actions]

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