Remove obsolete JavadocStyle check

[gianmarcoschifone]

Removes the obsolete JavadocStyle check because it is being removed from Checkstyle in checkstyle/checkstyle#20582.

If this project wants to keep validating Javadoc summaries, SummaryJavadoc is the more reliable replacement because it specifically validates summary text. I did not add it here because it currently introduces 674 violations, so that migration should be handled separately.

[sonarqubecloud]

Quality Gate passed

Issues
0 New issues
0 Accepted issues

Measures
0 Security Hotspots
0.0% Coverage on New Code
0.0% Duplication on New Code

See analysis details on SonarQube Cloud

[romani]

@rbri , this is good change.
Reason of update is that long time ago htmlunit got "partnership" with checkstyle on each commit validation usage in checkstyle CI, so you get all patches of migration even before we merge breaking change.

[rbri]

@romani / @gianmarcoschifone

Yes remember that and had this already in mind as the reason for this heads up.
And as always good things have some coincidences - currently working on a huge cleanup of the jdoc, therfore i directly switched to the SummaryJavadoc. Yes there are >600 error now but i guess i can solve them during the next weeks.

Thanks for all the work on checkstyle!

[romani]

update is done at 72249ce