microsoft / teams-ai / 7732834202

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[JS] fix: #1154, #1182, and #1157: TeamsAttachmentDownloader updates (#1207)

## Linked issues

fixes: #1154, #1182, #1157, 

## Details

Fix bugs to `TeamsAttachmentDownloader`

- No longer hardcoded to use public Azure cloud (getAccessToken now
allows for varying credential types & clouds)
- Allow localhost attachments 
- Only create request header for attachments when bot credentials are
enabled
- Update Card Gazer sample to send error messages for design use

## Attestation Checklist

- [x] My code follows the style guidelines of this project

- I have checked for/fixed spelling, linting, and other errors
- I have commented my code for clarity
- I have made corresponding changes to the documentation (updating the
doc strings in the code is sufficient)
- My changes generate no new warnings
- I have added tests that validates my changes, and provides sufficient
test coverage. I have tested with:
  - Local testing
  - E2E testing in Teams
- New and existing unit tests pass locally with my changes

### Additional information

> Feel free to add other relevant information below

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Co-authored-by: Corina Gum <>

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