IBX-12530: Allowed Bootstrapper to run against any KernelInterface, not just IbexaTestKernel

[Steveb-p]

🎫 Issue	IBX-12530

Related PRs:

• IBX-12530: Rebuilt DatabaseSchemaHook on SchemaBuilderInterface instead of a raw-file reimplementation #43 — this branches off it (it adds RemoveUnsatisfiableHooksPass, which this PR extends); retarget to 4.6 once that lands
• IBX-12530: Bootstrapped integration tests through Bootstrapper doctrine-migrations#8 — first consumer

Description:

Bootstrapper couldn't be used by a package testing its own bundle in isolation, for two independent reasons.

The type was the smaller one. KernelProvider asserted an IbexaTestKernel subclass and DatabasePreparer/Bootstrapper echoed that in their signatures — but none of those bodies touch anything beyond KernelInterface: an Application to run console commands through, a container, and shutdown(). All relaxed. FixtureKernelMethodProvider already worked this way, duck-typing getFixtures() off a plain KernelInterface with a docblock noting kernels are expected to move away from these methods anyway.

The bigger one was this bundle's own hooks. FixtureHook autowires FixtureImporter (registered by IbexaTestKernel::loadServices()), and both purge hooks reference ibexa.spi.search (registered by IbexaCoreBundle). So merely registering IbexaTestCoreBundle in a minimal kernel blew up container compilation before any test ran — relaxing the type alone would have got you nowhere.

#43 already added RemoveUnsatisfiableHooksPass for DatabaseSchemaHook, so this just adds the other three to its requirements map. One mechanism for every built-in hook rather than a special case per hook, and a kernel ends up with HooksExecutor plus whatever it can actually satisfy.

For QA:

KernelProviderTest gained testAcceptsAnyKernelInterfaceImplementation, booting a plain Kernel subclass that is deliberately not an IbexaTestKernel (39 tests total).

Behaviour checked in both directions:

• full kernel (ibexa/activity-log) — all four hooks still registered, 124 tests / 855 assertions with the same single pre-existing failure as before, i.e. the pass removes nothing when the services are present
• minimal kernel (ibexa/doctrine-migrations, no ibexa/core dependency at all) — all four hooks dropped, HooksExecutor present with zero hooks, suite green at 8 tests / 18 assertions