chore(updatecli): correct type of conditions for jdk21 manifest

[lemeurherve]

This PR replaces the type of conditions for the jdk21 updatecli manifest.
Unlike the jdk21-preview manifest this one is issued from, we have to check for the existence of docker images, not GitHub releases.

Fixup of #536

Fixes #555 and closes #552 and closes #560 (GA docker images not yet available)

Testing done

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[dduportal]

The updatecli diff command fails the JDK21 manifest with the following error:

ERROR: failed loading pipeline(s)
	* "updatecli/updatecli.d/jdk21.yaml" - yaml: line 46: mapping values are not allowed in this context

but I'm not sure why?

[dduportal]

LGTM!

Changed the title and labels (as this PR does not change the produced image so it can't be a "fix").

THe checks show the expected result: skipping JDK21 pipeline due to unpublished images