[8.x] Disable transaction events in DatabaseTransactions trait

[mfn]

This follows commit deafaa7
which already added this for RefreshDatabase.

It's for the exact same reason as outlined in #23832 :

This is motivated by the fact that in tests, when using the RefreshDatabase trait, transactions events are dispatched and may interfer with the application testing itself when it relies on events like these ( for further info, see laravel/ideas#1094 ).

As to not have custom handling of transaction events interfere with the
test suite itself, this simply disables this.

Again, the same change was added to RefreshDatabase and is still
present; this PR merely keeps the behaviour of them in sync in regards
to the handling of events in transactions:

framework/src/Illuminate/Foundation/Testing/RefreshDatabase.php

Lines 75 to 94 in 4d7eeb7

	foreach ($this->connectionsToTransact() as $name) {
	$connection = $database->connection($name);
	$dispatcher = $connection->getEventDispatcher();
	$connection->unsetEventDispatcher();
	$connection->beginTransaction();
	$connection->setEventDispatcher($dispatcher);
	}
	$this->beforeApplicationDestroyed(function () use ($database) {
	foreach ($this->connectionsToTransact() as $name) {
	$connection = $database->connection($name);
	$dispatcher = $connection->getEventDispatcher();
	$connection->unsetEventDispatcher();
	$connection->rollback();
	$connection->setEventDispatcher($dispatcher);
	$connection->disconnect();
	}
	});

Thanks

[GrahamCampbell]

This is a breaking change, so will need to target master.

[mfn]

Too bad; it was added to 5.6 during the release cycle too => but as suggested, switched branch to master.

Thank you!

[GrahamCampbell]

it was added to 5.6 during the release cycle too

Yeh, that was a mistake. Too late now.

[mfn]

Thanks 🙏