Add sidekiq network policy to allow communication with KAS in prod

What does this MR do?

Add sidekiq network policy to allow communication with KAS in prod

Related to:

• https://gitlab.com/gitlab-com/gl-infra/reliability/-/issues/23675
• gitlab-org/cluster-integration/gitlab-agent#43 (closed)

This removes the non-prod restriction for the policy added in !2735 (merged).

Author Check-list

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• Check if all of the following apply:
  • Assign to the correct reviewer per the contributing document
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  • Link to related MRs for applying the changes on other environments
  • Link to related Chef changes
  • If necessary link to a Criticality 4 Change Request issue

Reviewer Check-list

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  • Reviewed the diff jobs to confirm changes are as expected
  • No changes shown in the diffs not associated with this MR - This may require a rebase or further investigation

Applier Check-list

• Make sure there is no ongoing deployment for the affected envs before merging (see #announcements slack channel)