[Backport 2024.2] fix(jmx): fix wait for jmx up

[mergify]

As we now verify ports being open from sct runner, we cannot use it for jmx as it listens on localhost.

Fix by verifying JMX being up by verification of log message in scylla-jmx service status.

fixes: #8183

Testing

• - non root artifact test

PR pre-checks (self review)

• I added the relevant backport labels
• I didn't leave commented-out/debugging code

Reminders

• Add New configuration option and document them (in sdcm/sct_config.py)
• Add unit tests to cover my changes (under unit-test/ folder)
• Update the Readme/doc folder relevant to this change (if needed)

(cherry picked from commit abc641b)

Parent PR: #8190