Add more paths to crun runtime detection

[rlex]

Proposed Changes

Add /usr/local/bin and /usr/local/sbin to crun detection. Crun can also be installed manually, without packages, and /usr/local is preferred path when dealing with non-packaged software.

Types of Changes

New feature

Verification

Drop crun binary to /usr/local/bin or /usr/local/sbin, k3s should detect it and add to containerd config

Testing

This is just new path to detection, so i hasn't touched tests

Linked Issues

#9112

User-Facing Change

NONE

Further Comments

[brandond]

We're picking up a lot of different hardcoded paths here, I'm kinda starting to feel like we should just search $PATH for the bins with os.LookPath and be done with it.

[rlex]

I checked crun packages and it seems like it can be trimmed down to just /usr/bin and /usr/local/bin:

https://rpmfind.net/linux/RPM/fedora/updates/39/aarch64/Packages/c/crun-1.12-1.fc39.aarch64.html
https://ubuntu.pkgs.org/23.10/ubuntu-universe-amd64/crun_1.8.5-1_amd64.deb.html
https://centos.pkgs.org/9-stream/centos-appstream-aarch64/crun-1.11.2-1.el9.aarch64.rpm.html

As crun doesn't require any special permissions to just run, there is no need to put that to sbin

[brandond]

This looks good for now but I think I may rework the entire runtime detection code to reduce duplication at some point.

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Comparison is base (3190a5f) 46.35% compared to head (0ccabab) 41.65%.
Report is 7 commits behind head on master.

Additional details and impacted files

@@            Coverage Diff             @@
##           master    #9086      +/-   ##
==========================================
- Coverage   46.35%   41.65%   -4.71%     
==========================================
  Files         148      148              
  Lines       15900    15902       +2     
==========================================
- Hits         7371     6624     -747     
- Misses       7354     8149     +795     
+ Partials     1175     1129      -46     

Flag	Coverage Δ
e2etests	?
inttests	38.86% <100.00%> (-0.04%)	⬇️
unittests	18.37% <100.00%> (+0.01%)	⬆️

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