Prevent Memory Leak when using hideRequestParameters and hideRequestHeaders

[danilopinotti]

This PR aims to prevent a memory leak when we call the method hideRequestHeaders or/and hideRequestParameters multiple times with the same parameters. Ex:

Telescope::hideRequestHeaders(['cookie', 'x-csrf-token']);
Telescope::hideRequestHeaders(['cookie', 'x-csrf-token']);

It seems like an inoffensive issue, but it causes a memory leak in tests:

class MemoryLeakTest extends TestCaseUnit
{
    public function test_leaks_memory_on_1000_iterations()
    {
        $this->app->flush();
        $this->app = null;

        for ($i = 1; $i < 500; ++$i) {
            $this->createApplication()
                ->flush();

            if (! ($i % 10)) {
                dump('Using ' . ((int) (memory_get_usage(true) / (1024 * 1024))) . 'MB as ' . $i . ' iterations.');
            }
        }

        $this->app = $this->createApplication();
    }
}

The code above was copied from https://darkghosthunter.medium.com/laravel-fixing-memory-leaks-on-tests-4fe87b87f0ad

[driesvints]

This is definitely good but just fyi: Telescope shouldn't be enabled in tests.

[danilopinotti]

This is definitely good but just fyi: Telescope shouldn't be enabled in tests.

I agree with it, but even with the option TELESCOPE_ENABLED=false, the provider is initialized (except when it be configured as this session: https://laravel.com/docs/10.x/telescope#local-only-installation)