3.2.0-RC1 User registration and activation

What's Changed

• Add account registration and activation by @Sheikah45 in #147
• Bump com.vaadin from 24.2.2 to 24.2.5 by @dependabot in #197
• Bump kotlinVersion from 1.9.20 to 1.9.21 by @dependabot in #194
• Bump com.diffplug.spotless from 6.22.0 to 6.23.2 by @dependabot in #198
• Bump io.quarkus from 3.2.3.Final to 3.6.0 by @dependabot in #195

Full Changelog: 3.0.4...3.2.0-RC1