Filter activity log user options to remove null ("System")

[Boy132]

Small followup fix for #2475

[coderabbitai]

📝 Walkthrough

Walkthrough

Changes

Activity actor filtering

Layer / File(s)	Summary
Filter actor option cleanup app/Filament/Server/Resources/Activities/ActivityResource.php	The actor_id SelectFilter now removes null or empty plucked actor values from its options.

Possibly related PRs

• pelican-dev/panel#2475: Adds filtering behavior to the same activity table actor filter.

🚥 Pre-merge checks | ✅ 5

✅ Passed checks (5 passed)

Check name	Status	Explanation
Docstring Coverage	✅ Passed	No functions found in the changed files to evaluate docstring coverage. Skipping docstring coverage check.
Linked Issues check	✅ Passed	Check skipped because no linked issues were found for this pull request.
Out of Scope Changes check	✅ Passed	Check skipped because no linked issues were found for this pull request.
Title check	✅ Passed	The title clearly matches the main change: filtering activity log user options to remove the null System entry.
Description check	✅ Passed	The description is brief but still relevant, referring to the follow-up fix for issue #2475.

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