Avoid global write lock on every delete in GroupManager (#682)

Valery Kharseko

3 days ago 98c87302c0faad3dfa3e33c6d74eec6c4ee16369

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# Keep HTML checked out with LF on all platforms so javadoc doclint
# (JDK 25/26) does not treat CR (from CRLF) as part of a multi-line tag name.
*.html text eol=lf