[Subtask] Add Several Built-in Policies

### Describe the subtask

Create a set of built-in policy templates to help users get started quickly. These templates should cover common use cases and serve as examples for custom policy creation.

### Parent issue

#7139

Start by reading the parent issue #7139 and reviewing the existing policy-template and custom-policy examples in the repository. Identify the common use cases and template format specified there; the work is done when the requested built-in policies are added as usable examples and their expected behavior is covered by the project's relevant checks.

Written by the indexing model from the issue text.