`builtins.suppressWarnings` builtin

Is your feature request related to a problem?

I have the following flake: https://codeberg.org/Pandapip1/nixos-linux-rt. It automatically walks through all the nixpkgs kernels and creates PREEMPT_RT variants of them. However, because some filtering is necessary, I have to evaluate all of the entries, which triggers warnings:

evaluation warning: linux-rpi series will be removed in a future release. Please change to use nixos-hardware.
evaluation warning: linux-rpi series will be removed in a future release. Please change to use nixos-hardware.
evaluation warning: linux-rpi series will be removed in a future release. Please change to use nixos-hardware.
evaluation warning: linux-rpi series will be removed in a future release. Please change to use nixos-hardware.

Proposed solution

A builtin builtins.suppressWarnings that operates similarly to builtins.tryEval, except it suppresses warnings instead of eval errors.

Alternative solutions

The filtering code is as follows:

          upstreamKernels = pkgs.linuxKernel.kernels;
          safeKernels = lib.filterAttrs (_: isSafeKernel) upstreamKernels;
          rtKernels = lib.mapAttrs (_: mkRtKernel) safeKernels;

If builtins.filterAttrs existed (https://github.com/NixOS/nix/issues/11888), then safeKernels would not require the evaluation of the entirety of upstreamKernels, and I wouldn't have to deal with these warnings.

Additional context

N.A.

Checklist

• checked latest Nix manual (source)
• checked open feature issues and pull requests for possible duplicates

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