Enhance Frontend validation and UX when adding or editing Charts

**Is your feature request related to a problem? Please describe.**
Configuring the columns for a new chart can end up in long trial and error sequences if you're not familiar with the data, the data types and the chart types.

**Describe the solution you'd like**

1. X data column is required
2. Replace the empty option in Y data column with "Row count"
Currently, leaving an empty value defaults to `COUNT(*)`, which is the same regardless of selected Y column
3. Disable Y function dropdown if "Row count" is selected in Y data
4. Remove "Count" from Y function dropdown
5. Remove "Temporal data" field if it's not used

**Describe alternatives you've considered**
I did not think about other implementations.

**Additional context**