feat(teams-workflows): add rawCardPayload option to send AdaptiveCard directly

[aspenneberg]

Summary

Some Microsoft Teams webhook endpoints — particularly custom Power Automate flows — expect the AdaptiveCard JSON posted directly as the request body, without the standard Teams message envelope:

{ "type": "message", "attachments": [{ "contentType": "application/vnd.microsoft.card.adaptive", "content": { ...card... } }] }

These flows accept the card at the root level instead:

{ "type": "AdaptiveCard", "version": "1.4", "body": [...], "actions": [...] }

This PR adds a rawCardPayload boolean option to TeamsWorkflowsOptions, configurable at the same level as recipientUrls. When true, the service skips the envelope and sends the AdaptiveCard JSON directly as the POST body. The option works for both the built-in card builder and custom adaptiveCard JSON templates.

Configuration

service.teams-workflows: |
  recipientUrls:
    my-channel: https://prod-xx.westeurope.logic.azure.com/...
  rawCardPayload: true

Changes

• TeamsWorkflowsOptions: new RawCardPayload bool \json:"rawCardPayload"`` field
• teamsWorkflowsNotificationToReader: accepts the flag and returns bare card bytes when true, for both the custom adaptiveCard path and the built-in card builder path
• Two new tests: TestTeamsWorkflows_RawCardPayload_BuiltIn and TestTeamsWorkflows_RawCardPayload_CustomCard

Test plan

• go test ./pkg/services/... -run TestTeamsWorkflows — all existing tests pass, two new tests pass
• Verify with a custom Power Automate flow webhook that the card is delivered without the envelope when rawCardPayload: true
• Verify existing behaviour is unchanged when rawCardPayload is omitted (defaults to false)

[codecov]

Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 57.16%. Comparing base (da04400) to head (e8eea89).
⚠️ Report is 37 commits behind head on master.

Additional details and impacted files

@@            Coverage Diff             @@
##           master     #441      +/-   ##
==========================================
+ Coverage   55.41%   57.16%   +1.74%     
==========================================
  Files          46       48       +2     
  Lines        4125     3726     -399     
==========================================
- Hits         2286     2130     -156     
+ Misses       1511     1241     -270     
- Partials      328      355      +27     

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[pasha-codefresh]

Please add documentation