mgr-ssl-cert-setup: Store ca in db

[mcalmer]

What does this PR change?

Use mgr-ssl-cert-setup to store a new CA certificate in the database.
Drop this single task from spacewalk-setup.

GUI diff

No difference.

• DONE

Documentation

• Remove rhn-ssl-dbstore from ssl setup uyuni-docs#2359

• DONE

Test coverage

• No tests: already covered

• DONE

Links

Fixes https://github.com/SUSE/spacewalk/issues/21991
Tracks https://github.com/SUSE/spacewalk/pull/22020

• DONE

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[cbosdo]

@mcalmer I will need to have a chat with you on this one before you merge it: this could become a real pain for kubernetes

[cbosdo]

I created a card to remove the need of that CA in the DB for later

[mcalmer]

The failed test is not caused by this PR