Updates fromEndpoints&toEndpoints to be allow all

What does this MR do?

Updates fromEndpoints&toEndpoints to be allow all in order to be aligned with the humanized version which is based in allowing instead of denying logic. Text change was performed to revert a previous attempt for this fix.

This wasn't allowing all but actually denying all

spec:
  ingress:
    - {}

Therefore this MRs changes it to (which is aligned with https://docs.cilium.io/en/v1.8/policy/language/):

spec:
  ingress:
  - fromEndpoints:
    - matchLabels: {}

Related issue: #270130 (closed)

Screenshots (strongly suggested)

Before:

After:

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