Release 1.0-RC12

Release candidate 1.0-RC12, comes with a full upgrade to Java 17, GeoWebcache direct-WMS integration, and WMS reflector enablement through externalized configuration.

What's Changed

• Switch to Java17 with default docker images supporting cgroups v2 by @groldan in #193
• Add a request mapping for the WMS reflector by @groldan in #195
• Make WMS reflector enablement configurable by @groldan in #196
• Build/fmt maven plugin coordinates changed by @groldan in #197
• Remove dependency on gs-web-gwc from blobstores by @groldan in #198
• Contribute known org.geoserver.config.ServiceFactoryExtension implementations by @groldan in #200
• GeoWebCache direct WMS integration by @groldan in #199
• Handle virtual services in gwc-service by @groldan in #201
• Move modules to src/ folder, leaving the root pom as a pure bom by @groldan in #203
• Set up a geoserver submodule to build the geoserver-cloud_integration branch by @groldan in #204

Full Changelog: v1.0-RC11...v1.0-RC12