Store Solr 9 configs.

[rosiel]

Since Buildkit moved to Solr 9, the configs in site template cause problems. This caused #31 .

I replaced the solr config files with the downloaded export from Drupal. This will work on Buildkit tags that include Solr 9 (main or 3.1.0 or later).

[rosiel]

Testing instructions:

• Currently in Site Template, running docker compose --profile dev up -d results in screenfulls of red solr errors. Also, once the site is loaded, it complains that the solr server is not available.
• With this PR, you should be able to run that command and not get errors on your screen. Also when the site is up, you should be able to use solr out of the box.

[Natkeeran]

Tested this PR.

Without this pr, the solr does not get setup/configured properly, and thus Drupal is unable to connect to it. There were error messages in the solr end point (https://solr.islandora.dev).

With this pr, the solr gets setup properly, and Drupal is able to connect to it as expected (drupal-4.3.2-solr-9.x-0). This PR looks good to me.