Docs: Add Cloud Native steps to Pause CI/CD pipelines and jobs

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Problem to solve

Pause CI/CD pipelines and jobs in GitLab upgrade documentation has guidance for Omnibus envs, but not for Cloud Native.

Further details

Related to !209230 (comment 2828405707)

Proposal

Define steps to Pause CI/CD jobs in Cloud Native env - for Chart/Operator instances

Who can address the issue

Other links/references