Mark Eclipse Desktop Fuse Tooling as deprecated in JBoss Tools

With Fuse runtime 7.12, the templates and Karaf were not updated in Eclipse Desktop Fuse Tooling. It is time to mark the Eclipse Desktop Fuse Tooling as deprecated.
The impact of deprecation is that the Eclipse Desktop Fuse Tooling will remains in JBoss Tools as long as no other changes than upgrading versions needs to be done. If there is more to do due to Target Platform upgrades, it will be removed from JBoss Tools.

For Camel 3+ users, we can recommend to use VS Code extension pack for Camel or if they really want to stay on Eclipse to use Textual Language Support and Debug Adapter for Camel