Remove deprecated method DefaultConfiguration::addAtrribute from code

[romani]

Method marked as deprecated at 8.45 release (end of july 2021) https://github.com/checkstyle/checkstyle/commit/a42a3e1733f3c7583177a3c96de65e6a2fd7671f#diff-efcf78d0957b14212cbef50a335aac82c9820f9a7956d2a57f74bddbed6edd2eR142

issue https://github.com/checkstyle/checkstyle/issues/10164

We need to find some major version update time, and remove such methods from our API. We need to recheck plugins(maven, eclipse-cs, sonar, ...... gradle, idea.....) if they need to be updated or notify/help them to upgrade.

issue is created based on conversation : https://github.com/checkstyle/checkstyle/pull/11639

[rnveach]

Sevntu and sonar is using addAttribute. Eclipse and maven are not.

[romani]

@muhlba91, can you help to update Sonar code base to prepare for deprecation ?

[muhlba91]

i'll try to address this for the next release of the plugin.