[4.x] Laravel Octane fix: GateWatcher handles stack trace caller not found

[derekmd]

Fixes #1072 & #1122

TLDR: GateWatcher throws an exception because it can't find the PHP source code location that triggered a gate check for an app using Swoole/Laravel Octane.

With config('telescope.watchers.Watchers\GateWatcher.ignore_packages') enabled (the default setting), method getCallerFromStackTrace() returns null because only vendor/laravel/* code is traced through and no app/Http/Controllers/*.php file is reached. Middleware vendor/laravel/framework/src/Illuminate/Auth/Middleware/Authorize.php triggered the gate check and GateWatcher@recordGateCheck() throws an exception attempting to save the Telescope entry for a missing file location.

telescope/resources/js/screens/gates/preview.vue

Lines 38 to 43 in e31d4e7

	<tr v-if="slotProps.entry.content.file">
	<td class="table-fit font-weight-bold">Location</td>
	<td>
	{{slotProps.entry.content.file}}:{{slotProps.entry.content.line}}
	</td>
	</tr>

The UI hides caller file location details if they're not stored in the Telescope entry so set that path to null and prevent this exception.

This provides less details about what triggered gate checks in Octane apps, but the alternative is adding a GateWatcher entry creation fallback to a hardcoded value of Illuminate/Auth/Middleware/Authorize@handle().

Also fix the getCallerFromStackTrace() docblock for @return as method QueryWatcher@recordQuery() already has a conditional for when it returns null .