Hibernate Proposals Content Assist requires UI thread

Description of problem:

Hibernate proposals cannot be used with non-blocking completion as they require the UI thread.

Prerequisites (if any, like setup, operators/versions):

Steps to Reproduce

1. Install Eclipse IDE for Java Developers 2022-12
2. Install Hibernate Tools from JBoss Tools 4.26.0 Final from the Marketplace
   
3. Restart Eclipse
4. Navigate to `Window`>`Preferences`>`Content Assist`>`Advanced`
5. Activate `Enable non-blocking completion`

Actual results:

Non-blocking completion cannot be used with Hibernate proposals as they require the UI thread.

Expected results:

The hibernate plugin should not require the UI thread for completion proposals.

Reproducibility (Always/Intermittent/Only Once):

Always

Build Details:

Eclipse IDE for Java Developers (includes Incubating components)

Version: 2022-12 (4.26.0)
Build id: 20221201-1913

Hibernate Tools 5.4.19.v20221208-0949

Windows 11 (Microsoft Windows [Version 10.0.22000.1574])

Additional info (Such as Logs, Screenshots, etc):