fix: remove destructive setServerArray([]) in FiltersTest::setUp to prevent random-order test failures

[gr8man]

Description

FiltersTest::setUp() called service('superglobals')->setServerArray([]) which sets $_SERVER = [] for the entire process. Immediately after, Services::injectMock('superglobals', new Superglobals()) creates a new Superglobals instance from the now-empty $_SERVER, resulting in a mock with no argv key.

When tests run in random order, this mock persists from FiltersTest to other test classes that lack their own setUp() service reset (e.g. CorsTest). When CorsTest::testBeforeDoesNothingWhenCliRequest creates new CLIRequest(), the constructor calls parseCommand() → getServer('argv') which returns null from the empty mock, causing array_shift(null) to throw a TypeError.

The setServerArray([]) call is redundant — new Superglobals() without arguments already captures a clean snapshot of the current $_SERVER. Removing it restores the normal CLI argv values for all subsequent tests.

Verified with multiple random seeds, including the originally failing seed 1784667021.
https://github.com/codeigniter4/CodeIgniter4/actions/runs/29867283088/job/88758550319?pr=10417

[michalsn]

LGTM!

[michalsn]

Thank you @gr8man!