Bug: bad cache isolation between two sessions (#11083)

Port of Maven 3 bugfix to Maven 4 (deprecatd)
`maven-embedder` module. Maven 4 by default is
**not affected**, but this PR aligns Maven 3
and deprecated module in Maven 4.

The "early" session used to load extension will populate
cache in MavenExecutionRequest and same cache is later
reused in "normal" session as well.

This is wrong, as if project uses same parent POM as any
of loaded extnsions, data loss in form of lost input
locations occurs.

Fixes #11081

Author: cstamas

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

@@ -964,6 +964,7 @@ private void encryption(CliRequest cliRequest) throws Exception {
 
     private int execute(CliRequest cliRequest) throws MavenExecutionRequestPopulationException {
         MavenExecutionRequest request = executionRequestPopulator.populateDefaults(cliRequest.request);
+        request.setRepositoryCache(new DefaultRepositoryCache()); // reset caches
 
         if (cliRequest.request.getRepositoryCache() == null) {
             cliRequest.request.setRepositoryCache(new DefaultRepositoryCache());