[database watcher] Fix blocking tooltips

[dimitri-furman]

Summary

Fix invalid tooltips in the activity grid that appeared for all sessions instead of only for sessions participating in a blocking chain.

Screenshots

Validation

• Validate your changes using one or more of the testing methods.

  Make sure you've tested your template content. Fixing things while in PR is trivial. Hotfixing it later is very expensive; at the current time at least 3 teams are involved in a hotfix!

Checklist

• If you are adding a new template, gallery, or folder, add your team and folder/file(s) to the CODEOWNERS file at the root of the repo. CODEOWNERS entries should be teams, not individuals.
  When done correctly, this means that from then on your team does reviews of your things, not the workbooks team.
• Ensure all steps in your template have meaningful names.
• Ensure all parameters and grid columns have display names set so they can be localized.