VRR capable monitor detection (New)

[tomli380576]

Description

This PR implements a script that can detect whether the DUT is connected to any VRR capable monitors. This is supposed to act as the resource job for graphics/variable-refresh-rate-manual when has_vrr is set to true. See #2464 for more context. #2464 and this PR can be merged in any order, they don't reference each other yet. There will be 1 last PR after this one is merged to put everything together.

Resolved issues

#2464 as it is right now doesn't actually check whether the DUT is connected to a VRR capable monitor.

Documentation

The basic idea is to mimic what modetest -connectors does (this command comes from libdrm-tests). modetest will print these lines for a VRR capable monitor:

103 vrr_capable:
    flags: immutable range
    values: 0 1
    value: 1

If VRR is impossible, this property is either 0 or missing altogether. This script uses the same libdrm API calls to find this value.

The exact lines we are mimicking

Tests

Manually checked the output of this script against GNOME's output in gnome settings.

[codecov]

Codecov Report

❌ Patch coverage is 96.82540% with 2 lines in your changes missing coverage. Please review.
✅ Project coverage is 58.94%. Comparing base (03581f9) to head (09b46dd).
⚠️ Report is 37 commits behind head on main.

Files with missing lines	Patch %	Lines
providers/base/bin/detect_vrr.py	96.82%	1 Missing and 1 partial ⚠️

Additional details and impacted files

@@            Coverage Diff             @@
##             main    #2465      +/-   ##
==========================================
+ Coverage   58.86%   58.94%   +0.08%     
==========================================
  Files         476      477       +1     
  Lines       48007    48070      +63     
  Branches     8570     8585      +15     
==========================================
+ Hits        28260    28337      +77     
+ Misses      18855    18840      -15     
- Partials      892      893       +1     

Flag	Coverage Δ
provider-base	34.33% <96.82%> (+0.32%)	⬆️

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