Test for Fix alpha debug overlay rendering in probes and breaking scene lighting

[Dan-Linden]

Environment

Unknown

Description

This is a test for #5058

Reproduction steps

See RyeMutt's comment below.

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[RyeMutt]

1. Go to https://maps.secondlife.com/secondlife/Testylvania%20Sandbox/118/200/22
2. Set graphics quality slider to Mid or higher
3. Set World->Environment to Midday
4. Enable alpha debug preview rendering with Ctrl-Alt-T
5. Verify scene does not contain a red tint like:

and not like:

[Dan-Linden]

Passed QA.
Verified on Second Life Release 2026.1.0.20116586066 on Win11/OSX in the scope of https://github.com/secondlife/iqa/issues/581