[13.x] fix: respect channel name for on-demand log stacks

[maltf0]

This PR fixes the channel name handling in LogManager::stack(array $channels, $channel = null).

stack() currently passes the second argument to the stack driver config as channel:

$this->createStackDriver([
    'channels' => $channels,
    'channel' => $channel,
]);

However, createStackDriver() resolves the Monolog channel name via parseChannel(), which reads the name key. As a result, the explicit channel name is ignored and Laravel falls back to the application environment name.

For example:

Log::stack(['stack_probe'], 'expected_channel')
    ->getLogger()
    ->getName();

Currently returns the fallback channel name:

'local'

instead of:

'expected_channel'

This PR passes the value using the expected name key and adds a regression test for the explicit channel name.

This is backward compatible: calls without a channel name keep the existing fallback behavior, while calls with an explicit channel name now use it correctly.

[github-actions]

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