Disable license plugin by default (#24742)

distribution/src/main/resources/META-INF/THIRD-PARTY.txt

@@ -0,0 +1,3 @@
+Placeholder file for THIRD-PARTY.txt
+
+This file avoids failure by the assembly plugin when license-maven-plugin is skipped.

pom.xml

@@ -187,6 +187,13 @@
         <shade.jar-with-dependencies.phase>package</shade.jar-with-dependencies.phase>
         <fat.dependency.classifier>jar-with-dependencies</fat.dependency.classifier>
 
+        <!--
+        License plugin is not thread-safe, leads to flaky failures when checking licenses, so it is skipped by default.
+        to run the build with license plugin run with `-T1 -Dlicense.skipAddThirdParty=false`.
+        The `-T1` parameter disables the parallel build.
+        -->
+        <license.skipAddThirdParty>true</license.skipAddThirdParty>
+
         <!--
         Allow access to Operating system metrics:
            open jdk.management/com.sun.management.internal
@@ -268,6 +275,7 @@
                     <include>**/*.xml</include>
                     <include>**/*.yaml</include>
                     <include>**/*.xsd</include>
+                    <include>**/*.txt</include>
                     <include>**/hazelcast-config-*.json</include>
                     <include>**/*.handlers</include>
                     <include>**/*.schemas</include>