fix(core): handle visibility if namespace info is missing

[rksharma95]

Purpose of PR?:

this PR fixes Visibility Issue that might occur due to Pod-Container event latency. in case if container runtime detect the containers and emit those events before the pod events then the namespace value will not be present and the visibility will be defined incorrectly irrespective of namespace level visibility configuration.

Fixes #

Does this PR introduce a breaking change?

If the changes in this PR are manually verified, list down the scenarios covered::

Additional information for reviewer? :
Mention if this PR is part of any design or a continuation of previous PRs

Checklist:

• Bug fix. Fixes #
• New feature (non-breaking change which adds functionality)
• Breaking change (fix or feature that would cause existing functionality to not work as expected)
• This change requires a documentation update
• PR Title follows the convention of <type>(<scope>): <subject>
• Commit has unit tests
• Commit has integration tests

[daemon1024]

Please don't commit changes in enforcer/*