fix(webhook): set resolution_date and lead_time_minutes on incident c…

[bujjibabukatta]

Summary

Fixes #8906

What happened

When closing an incident via the webhook API (POST /plugins/webhook/:connectionId/issue/:issueKey/close), the resolution_date field was never set on either the issues or incidents table. The DORA FDRT (Failed Deployment Recovery Time) metric is calculated from incidents.resolution_date, so incidents closed this way never appeared in the DORA dashboard.

Root Cause

In backend/plugins/webhook/api/issues.go, the closeIssue function set Status to DONE and cleared OriginalStatus for both the issue and incident records, but never set ResolutionDate or recalculated LeadTimeMinutes.

Changes

backend/plugins/webhook/api/issues.go

• Set ResolutionDate to time.Now() if not already set when closing an issue
• Recalculate LeadTimeMinutes from CreatedDate to ResolutionDate if not already set when closing an issue
• Same two changes applied to the incident record

[bujjibabukatta]

Hi @klesh could you please approve pull request?

[klesh]

LGTM