Add tracking spam prevention plugin as a submodule #17016

Description:

See https://github.com/matomo-org/plugin-TrackingSpamPrevention for the features that were added.

Review

• [ ] Functional review done
• [ ] Usability review done (is anything maybe unclear or think about anything that would cause people to reach out to support)
• [ ] Security review done see checklist
• [ ] Code review done
• [ ] Tests were added if useful/possible
• [ ] Reviewed for breaking changes
• [ ] Developer changelog updated if needed
• [ ] Documentation added if needed
• [ ] Existing documentation updated if needed

@diosmosis @sgiehl I suppose it is normal that we run all the UI tests of a plugin with a submodule again? Like in https://builds-artifacts.matomo.org/matomo-org/matomo/4.x-dev/44659/

@tsteur I think it's because we consider the plugins bundled w/ core to be tested this often (testing compatibility on every matomo change). Otherwise the tests would only run when the plugin changes, even though a change in core could cause problems.

Remaining test failures seem unrelated. Btw @tsteur did we decide if this plugin will be shipped with Matomo or if it will be available through Marketplace? We might need to adjust the build script maybe 🤔

@sgiehl it should be not included in core but instead it is already on the marketplace. Do we need to adjust anything?