chore: remove deprecated horses, clubs, officials, and persons services

- Deleted obsolete modules related to horses, clubs, officials, and persons services, including their configurations, build files, and database provisioning scripts.
- Cleaned up associated references in the project structure (e.g., `settings.gradle.kts`).
- Removed unused database tables and Spring beans related to these domains.

Signed-off-by: Stefan Mogeritsch <stefan.mo.co@gmail.com>

backend/services/masterdata/masterdata-common/build.gradle.kts

@@ -3,8 +3,9 @@ plugins {
 }
 
 dependencies {
-    implementation(projects.masterdata.masterdataDomain)
+  implementation(projects.backend.services.masterdata.masterdataDomain)
     implementation(projects.core.coreDomain)
     implementation(projects.core.coreUtils)
+  implementation(libs.kotlinx.datetime)
     testImplementation(projects.platform.platformTesting)
 }