Fix validation errors about using unsupported linear filtering

[gary-sweet]

Description

Most of the samples, and parts of the framework, just build samplers using linear filtering and mipmap-modes. This is only guaranteed to be supported for a handful of formats. On my hardware this results in a large number of validation errors.

Fixes #923

General Checklist:

Please ensure the following points are checked:

• [x] My code follows the coding style
• [x] I have reviewed file licenses
• [x] I have commented any added functions (in line with Doxygen)
• [x] I have commented any code that could be hard to understand
• [x] My changes do not add any new compiler warnings
• [x] My changes do not add any new validation layer errors or warnings
• [x] I have used existing framework/helper functions where possible
• [x] My changes do not add any regressions
• [x] I have tested every sample to ensure everything runs correctly (those that run for me at least)

• [x] This PR describes the scope and expected impact of the changes I am making

  Note: The Samples CI runs a number of checks including:

  • [x] I have updated the header Copyright to reflect the current year (CI build will fail if Copyright is out of date)
  • [x] My changes build on Linux

[gary-sweet]

Sorry, needed to rebase to resolve merge conflicts.

[gary-sweet]

Sorry, I needed to rebase this due to merge conflicts in mobile_nerf.cpp

[gary-sweet]

Rebased again after yesterday's merges caused more conflicts

[gary-sweet]

More merge conflicts I'll need to look at again - sigh.

I can't seem to get this past 2 approvals before someone else merges something.

[SaschaWillems]

That's annoying.

@marty-johnson59 : I don't think we need three approvals on this. It's just a bugfix and the code is perfectly fine. Can we merge once Gary has fixed the current merge conflicts?

[gary-sweet]

@marty-johnson59 : I don't think we need three approvals on this. It's just a bugfix and the code is perfectly fine. Can we merge once Gary has fixed the current merge conflicts?

Thanks Sascha, that would be great if possible.

[marty-johnson59]

OK, I'll merge. LMK if this causes problems.