fix: preserve geometry display for joined results - #20466

Description

Decouple geometry presentation from row editability by removing the possible_as_geometry session value written by Sql and the DisplayResults fallback that replaces GEOM with WKT for non-editable results. Render the Geometry radio option unconditionally and remove the obsolete option data passed to the Twig template, while leaving edit/delete-link eligibility unchanged. Update the existing result-rendering expectations and multi-table query fixture to reflect the always-available Geometry choice.

A geometry column is normally rendered as a compact [GEOMETRY - N B] value, but a query containing a join is classified as non-editable and silently switches the geometry display mode to WKT. That exposes the full polygon text even when partial-text display is active. The editability decision is valid for row action links, but it is unrelated to whether a result value can be rendered in the compact geometry mode. The issue includes a reproducible schema and query, and the thread identifies the possible_as_geometry gate as the cause.

Fixes #20430