Fix flaky "tests-apple" CI job in modeladmin test suite

[Copilot]

The tests-apple (1.26.x) job was failing on the ConfigService PatchConfig spec "serializes lifecycle publication across local service instances" with Timed out after 1.005s.

Root cause

• The spec spawns a goroutine and waits with Eventually(lifecycle.entered).Should(Receive()) for it to reach a blocking lifecycle call, relying on Gomega's default 1s Eventually timeout.
• On slower/loaded macOS CI runners, goroutine scheduling can exceed 1s, causing a spurious timeout unrelated to actual test logic.
• Several other specs in this suite coordinate goroutines the same way via the blockingRevisionLifecycle test helper, so they're all susceptible to the same flake.

Fix

• Raise the suite-wide default Gomega Eventually timeout to 5s in core/services/modeladmin/modeladmin_suite_test.go, giving goroutine-coordination specs enough headroom on slower runners without altering test semantics or production code.

func TestModelAdmin(t *testing.T) {
	RegisterFailHandler(Fail)
	SetDefaultEventuallyTimeout(5 * time.Second)
	RunSpecs(t, "modeladmin test suite")
}

[localai-org-maint-bot]

@mudler, this looks good to merge once the draft is ready. The 5s suite default directly covers the repeated goroutine-coordination waits without changing production behavior; go test ./core/services/modeladmin and git diff --check pass locally.