Fixes #25123 - template requirements and seeding with import

- Changes seeding mechanism for provisioning and report templates. It
uses template importing now.
- Template import allows checking for presence of templates in certain
versions. Metadata can contain section `require:` with list of
requirements.

For example:
  require:
    - plugin: katello  # checks whether Katello is installed in any version
    - plugin: katello
      version: 3.9.0   # checks whether Katello >- 3.9.0 is installed