Add boilerplate module to project

[erikgb]

This adds the boilerplate module to the makefile-modules own make setup. This will ensure the boilerplate check is included in make verify, and also reduce duplication.

[cert-manager-prow]

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[erikgb]

/cc @inteon

[Copilot]

Pull request overview

This PR integrates the existing boilerplate makefile-module into this repository’s top-level Makefile, so that boilerplate/license header verification is included in the standard make verify flow and the repo no longer duplicates the target definition locally.

Changes:

• Include modules/boilerplate/00_mod.mk and modules/boilerplate/01_mod.mk in the root Makefile.
• Remove the locally defined verify-boilerplate target from the root Makefile (now provided by the module).
• Document the boilerplate module in the list of modules used by this repo.

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