Timescale/Postgres query builder missing options that were present in older versions

### What happened?

The postgres/timescale query builder has been completely changed since past versions and is missing a ton of functionality.

Old:

New:

We're missing the ability to remap the time column and the WHERE clause, at least. Why remove this?

### What did you expect to happen?

I expected the latest version of Grafana to have a user interface that at least contains the features that older versions had. Why *remove* the features from the query builder?

### Did this work before?

Yeah. Deleting a feature from UI makes that feature stop working.

### How do we reproduce it?

Try to use the Postgres query builder.

### Is the bug inside a dashboard panel?

_No response_

### Environment (with versions)?

Grafana v12.3.2 (df2547decd)

Linux/Firefox

### Grafana platform?

Docker

### Datasource(s)?

Postgres/Timescale

Use the old and new query-builder screenshots as the starting reference, then inspect the Postgres/Timescale query builder and compare its available options with the older version. Confirm how time-column remapping and WHERE-clause editing previously worked; done means those controls and their query behavior are restored or their intended replacement is defined.

Written by the indexing model from the issue text.