Prevent duplication of gem installation with bundler `--prefer-local` option

As a follow up to https://github.com/elastic/logstash/issues/17873 the bunlder flag `--prefer-local` should be used to prevent duplicating gem installation with bundler for gems included with jruby. Gems that explicitly must be duplicated (IE if the version shipped with jruby is unsuitable) will still be cleaned with the deduplication logic. Note that this was not included inititally due to jruby 9.4.13.0 not having a sutiable version of rubygems/bundler. See https://github.com/elastic/logstash/pull/18451 for investigation on carrying the patch that is required. Taking up this change will be blocked on a jruby release with a suitable rubygems version. Make sure that the pluginmanager and bundler patch in LS works with the forthcoming release.

Start with the pluginmanager and Bundler patch in Logstash, then review the investigation in pull request 18451 and the deduplication logic. Verify the forthcoming JRuby release has suitable Rubygems and Bundler versions, and confirm that --prefer-local prevents duplicate installation while explicitly incompatible gems are still cleaned up.

Written by the indexing model from the issue text.