feat: avoid error logging on gitlab optional section parsing (#11881)

feat: avoid error logging on gitlab optional section parsing

Merge branch 'master' into daniel.mohedano/codeowners-optional-section

Co-authored-by: daniel.mohedano <daniel.mohedano@datadoghq.com>

Author: daniel-mohedano

dd-java-agent/agent-ci-visibility/src/main/java/datadog/trace/civisibility/codeowners/EntryBuilder.java

@@ -54,7 +54,10 @@ public EntryBuilder(CharacterMatcher.Factory characterMatcherFactory, String s)
 
       if (offset == c.length // empty line
           || c[offset] == '#' // comment
-          || c[offset] == '[') { // section header
+          || c[offset] == '[' // section header
+          || (c[offset] == '^'
+              && offset + 1 < c.length
+              && c[offset + 1] == '[')) { // GitLab optional section header (^[...])
         return null;
       }