[database watcher] Improve storage utilization charts to show maximum storage size

[dimitri-furman]

Summary

Add a Max data/Max log series to storage consumption charts.

Screenshots

Validation

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

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.