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

[corinagum]

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

• 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

[singhk97]

The .vscode and env folders should also be moved to the cardGazer folder. They are both needed for the F5 debug flow. It's possible that the F5 flow will trip if the env folder (and the env.local file) is missing.