Add missing columns to gwctl get policies

[jongwooo]

What type of PR is this?

/kind feature
/area gwctl
/cc @gauravkghildiyal

What this PR does / why we need it:

Add missing columns to gwctl get policies.

Output Columns	Description	Visibility
NAME	Name of the Policy
KIND	The kind of policy in the form <kind.group>
TARGET NAME	Name of the resource the policy applies to
TARGET KIND	The kind of target resource in the form
POLICY TYPE	Type of policy (Inherited or Direct)
AGE	Age of the Policy

Which issue(s) this PR fixes:

Fixes #2807

Does this PR introduce a user-facing change?:

Add missing columns to `gwctl get policies`

[gauravkghildiyal]

/assign

[jongwooo]

I'll work on injecting the fack clock during testing.

[gauravkghildiyal]

Thanks @jongwooo! Just one small request and rest all good :) Thank you for the patience.

[gauravkghildiyal]

/lgtm
/approve

[k8s-ci-robot]

[APPROVALNOTIFIER] This PR is APPROVED

This pull-request has been approved by: gauravkghildiyal, jongwooo

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