Resolve "Productivity Analytics: Limit graph scales to whole numbers"

What does this MR do?

Sets the minimum interval for productivity analytics charts to 1 to limit the scale to whole numbers.

Screenshots

Before	After

Does this MR meet the acceptance criteria?

Conformity

• Changelog entry
• Documentation (if required)
• Code review guidelines
• Merge request performance guidelines
• Style guides
• [-] Database guides
• Separation of EE specific content

Availability and Testing

• [-] Review and add/update tests for this feature/bug. Consider all test levels. See the Test Planning Process.
• Tested in all supported browsers

Closes #32075 (closed)