Remove Sentry

- Remove automatic error reporting and server-identifying attachments.
- Remove Sentry dependencies, release tooling, settings, and test commands.
- Keep failures operator-visible through local stack traces and logging.

adapters/bukkit/plugin/build.gradle

@@ -21,7 +21,6 @@ dependencies {
     testImplementation('org.mockito:mockito-core:5.23.0')
     testImplementation(libs.paper.api)
     testImplementation(libs.bstats)
-    testImplementation(libs.sentry)
     testImplementation(project(':core'))
     testImplementation(volmLibCoordinate) {
         transitive = false