ENG-3924: Add info-level execution logs for paused privacy request status transitions

[eastandwestwind]

Ticket ENG-3924

Description Of Changes

When a privacy request is paused, the status alone doesn't explain why. It could be a webhook halt, a batch email send, or an access review. This adds info-level execution logs for pause transitions so the reason is visible in the Admin UI's Activity tab.

Adds an info status to ExecutionLogStatus and creates execution log entries at the 3 pause transition points where the reason isn't obvious from status alone.

Code Changes

• Added info = "info" to ExecutionLogStatus enum (no migration needed — string column)
• Added add_info_execution_log() method on PrivacyRequest model
• Added info execution logs at 3 pause transition points:
  • request_runner_service.py — request paused by webhook halt instruction (main execution path)
  • request_runner_service.py — request paused by webhook in run_webhooks_and_report_status
  • email_batch_service.py — request paused after batch email send
• Added INFO to frontend ExecutionLogStatus enum with blue tag color
• Added unit tests for info status and webhook halt info log

Steps to Confirm

1. Set up a policy pre-execution webhook that returns {"halt": true}
2. Create a privacy request — it should transition to Paused
3. Click into the request → Activity tab
4. Verify an Info (blue tag) entry appears with message "Request paused by webhook: {key}"
5. Verify existing error/success/skipped execution logs are unaffected

Pre-Merge Checklist

• Issue requirements met
• All CI pipelines succeeded
• CHANGELOG.md updated
  • Add a db-migration This indicates that a change includes a database migration label to the entry if your change includes a DB migration
  • Add a high-risk This issue suggests changes that have a high-probability of breaking existing code label to the entry if your change includes a high-risk change
  • Updates unreleased work already in Changelog, no new entry necessary
• UX feedback:
  • No UX review needed
• Followup issues:
  • No followup issues
• Database migrations:
  • No migrations
• Documentation:
  • No documentation updates required

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2 Skipped Deployments

Project	Deployment	Actions	Updated (UTC)
fides-plus-nightly	Ignored	Preview	May 21, 2026 12:20pm
fides-privacy-center	Ignored		May 21, 2026 12:20pm

[github-actions]

Title	Lines	Statements	Branches	Functions
admin-ui		8.54% (4053/47447)	7.59% (2094/27561)	5.82% (812/13944)
fides-js		79.17% (1977/2497)	66.25% (1249/1885)	73.31% (349/476)
privacy-center		83.95% (403/480)	81.25% (208/256)	76.13% (67/88)