Upgrade SOLR to 8.8.1

[esune]

The image currently in use for the search-engine (SOLR) is based on an outdated version (6.6).

Work has recently been done in bcgov/openshift-solr to upgrade the version of SOLR to 8.8.1: the changes need to be propagated to the OrgBook configurations.

The steps to upgrade should be the following:

• update the build process to use the solr-8.8.1 branch in the source repository, so that the newer version is built and used
• test the system with the current set of configuration files: things should work as-is, however updates are going to be necessary to ensure there is no version mismatching between the base system and the installed plugins
• tweak configurations as needed to align with the new codebase

All work should be PR'd back into the feature/ocp4 branch.

[esune]

Some preliminary testing was completed on this, everything seems to be working as expected.

The upgrade process is as follows:

• upgrade aries-vcr to reference the new 8.8.1 version for the luceneMatchVersion setting in server/solr/cores/credential_registry/conf/solrconfig.xml
• update the solr-base build to use the 8.8.1 branch (or merge the branch into the main branch in the repository)
• build solr using the new configuration
• start solr and trigger a reindex

After indexing is completed, everything should be working as expected.