This `resent_certificate` activity is generated from the edit user flow
in fleet server.
**Related issue:** Resolves#49007
## Testing
- [x] Added/updated automated tests
- [x] QA'd all new/changed functionality manually
For unreleased bug fixes in a release candidate, one of:
- [x] Confirmed that the fix is not expected to adversely impact load
test results
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## Summary by CodeRabbit
* **New Features**
* Device-to-identity-provider mapping changes can now generate
certificate resend activities when applicable.
* Certificate resend activities can now be marked as automated versus
manual.
* **Improvements**
* Certificate resend details are produced when SCIM host-user mappings
are added, updated, or removed.
* If creating the associated resend activities fails, the mapping change
still proceeds; errors are handled non-blockingly.
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Konstantin Sykulev
1318b3c017