[MNG-8228] Enable Sisu Plexus strict classpath scanning (#1688)

This was introduced with
eclipse-sisu/sisu.plexus#51.

This leads to exceptions in case of issues with loading potential
extensions/plexus components instead of logging just with DEBUG level.

Author: kwin

maven-embedder/src/main/java/org/apache/maven/cli/MavenCli.java

@@ -672,6 +672,7 @@ PlexusContainer container(CliRequest cliRequest) throws Exception {
                 .setClassPathScanning(PlexusConstants.SCANNING_INDEX)
                 .setAutoWiring(true)
                 .setJSR250Lifecycle(true)
+                .setStrictClassPathScanning(true)
                 .setName("maven");
 
         Set<String> exportedArtifacts = new HashSet<>(coreEntry.getExportedArtifacts());
@@ -780,6 +781,7 @@ private List<CoreExtensionEntry> loadCoreExtensions(
                 .setClassPathScanning(PlexusConstants.SCANNING_INDEX) //
                 .setAutoWiring(true) //
                 .setJSR250Lifecycle(true) //
+                .setStrictClassPathScanning(true) //
                 .setName("maven");
 
         DefaultPlexusContainer container = new DefaultPlexusContainer(cc, new AbstractModule() {