Implement customization of rolePrefix in LdapUserDetailsManager

[Haarolean]

Resolves #2083

[jzheaux]

Thanks, @Haarolean! In addition to the inline feedback, will you please add some tests to LdapUserDetailsManagerTests for the new feature? And, will you please squash and format any commits into a single commit like so:

Commit Title (for example, Add Customization of rolePrefix in LdapUserDetailsManager)

Closes gh-2083

(quite similar to what you have already, just shortening the title and adding the Closes phrase to the description)

[jzheaux]

Hi, @Haarolean, are you able to make the requested changes? I'm happy to help, if not.

[Haarolean]

Hi, @Haarolean, are you able to make the requested changes? I'm happy to help, if not.

Hey, sure am! Been busy a bit lately, will push the changes today.

[Haarolean]

@jzheaux do we have any instructions on how to enable checkstyle properly? Having a hard time with checkstyle (as always) in spring projects, I've imported the etc/checkstyle/checkstyle.xml as a scheme into IDEA via chsckstyle plugin, but despite that some things like import ordering are not being fixed automatically.

[jzheaux]

Thanks again, @Haarolean! This is now merged into main, including one polish commit to restore the Acegi header (we only change the ones in the form 20xx-20yy for now).

[Haarolean]

@jzheaux thank you! Didn't know about the header part.