The javac problem matcher only recognized javac's native diagnostic
format (File.java:12: warning: msg), which works for plain javac and
Gradle but not Maven. The maven-compiler-plugin reformats diagnostics
to [WARNING] /path/File.java:[12,5] msg, so Maven builds produced zero
annotations.
Add a new maven-javac matcher owner that recognizes the Maven format,
capturing severity, file, line, column, and message. Maven builds now
annotate consistently with Gradle and plain javac.
Fixes: #1085
(cherry picked from commit cf9e5e7084)
Co-authored-by: Copilot App <223556219+Copilot@users.noreply.github.com>
