Add predefined network policies to the network policy list

What does this MR do?

As a part of #220253 (closed) we want to provide a set of predefined policies that users can quickly try. Such policies start in disabled state and don't have a timestamp on them, they mimic behavior of the user defined policies. Once predefined policy is deployed it's removed from the list since it will appear as a user defined policy. This MR adds 2 predefined policies and necessary changes to the component.

Screenshots

List with predefined policies	Enabled predefined policies

Does this MR meet the acceptance criteria?

Conformity

• Changelog entry
• Documentation (if required)
• Code review guidelines
• Merge request performance guidelines
• Style guides
• Database guides
• Separation of EE specific content

Availability and Testing

• Review and add/update tests for this feature/bug. Consider all test levels. See the Test Planning Process.
• Tested in all supported browsers
• Informed Infrastructure department of a default or new setting change, if applicable per definition of done

Security

If this MR contains changes to processing or storing of credentials or tokens, authorization and authentication methods and other items described in the security review guidelines:

• Label as security and @ mention @gitlab-com/gl-security/appsec
• The MR includes necessary changes to maintain consistency between UI, API, email, or other methods
• Security reports checked/validated by a reviewer from the AppSec team