rfb: ensure logging of incompletely parsed txs

[satta]

• I have read the contributing guide lines at https://suricata.readthedocs.io/en/latest/devguide/codebase/contributing/contribution-process.html
• I have signed the Open Information Security Foundation contribution agreement at https://suricata.io/about/contribution-agreement/
• I have updated the user guide (in doc/userguide/) to reflect the changes made (if applicable)

Link to redmine ticket: #5912

Describe changes:

• Mark skipped txs as complete so they get logged with the data we were able to gather so far. See 5912 rfb skip v4 #9071 (comment)

[jasonish]

Is an S-V test possible that shows failure in master, but success after this PR?

[satta]

Is an S-V test possible that shows failure in master, but success after this PR?

I'll see if I can get a pcap of, say, an Apple RFB session, for which there is no authentication parsing, and see if I can get partial events logged.

[satta]

Found one, see OISF/suricata-verify#1274. Will open a new PR using that.

[satta]

Next PR: #9114