NIFI-9351 Exclude test dependencies from nifi-scripting-nar

[exceptionfactory]

Description of PR

NIFI-9351 Excludes JUnit and TestNG dependencies from the groovy-all dependency declaration in nifi-scripting-nar and nifi-groovyx-nar. This change avoids including unnecessary test dependencies during runtime processing.

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[mattyb149]

+1 LGTM, ran mvn clean install -Pcontrib-check then dependency:tree on both bundles, verified there are no test dependencies other than in test scope. Thanks for the fix and the quick turnaround! Merging to main