add certificate posturecheck support

[pascal-fischer]

Issue ticket number and link

Documentation

Select exactly one:

• I added/updated documentation for this change
• Documentation is not needed for this change (explain why)

Docs PR URL (required if "docs added" is checked)

Paste the PR link from https://github.com/netbirdio/docs here:

https://github.com/netbirdio/docs/pull/__

E2E tests

Optional: override the image tags used by the Playwright e2e workflow.
Defaults to main when omitted.

management-cloud-tag: main
reverse-proxy-tag: main

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