Gizmos: Opt-out of post-processing

## What problem does this solve or what need does it fill?

Gizmos are useful tools for debugging.

I'd like to be able to clearly see them despite any post-processing effects.

## What solution would you like?

Be able to opt-out of having gizmos post processed.

## Alternatives

Maybe trying to render the gizmos to a separate render target then blitting it on top of the first perhaps..

## Additional context

See the effect of depth of field on gizmos below:

https://github.com/user-attachments/assets/c1a2c32c-675f-4148-81f0-648833d79ae0

No source files, tests, or entry points are identified in the issue. Start by reproducing the depth-of-field effect on gizmos and trace how gizmos enter the post-processing pipeline. Done means there is a documented opt-out path and gizmos remain visibly unaffected by post-processing.

Written by the indexing model from the issue text.