EDID test fails at maximum resolution (BugFix)

[p-gentili]

Description

Another PR dedicated to the EDID job. It turns out that the new implementation (#1286) shed some light on the other related problem, where older machines could read the maximum allowed resolution.

In case where the HW doesn't support an available mode from the monitor EDID, no preferred mode is available (which makes sense). This PR takes care of such scenario, attempting to configure the monitor with the maximum available resolution.

1. in case the maximum allowed resolution still matches what the test requested, the assertion over the actual configuration is performed as usual. Common example is with unsupported refresh rate.
2. in case the maximum allowed resolution is lower than requested, the testcase can be skipped since we can assume the HW does not support it. Common example is 2K resolution with HDMI < 1.3

Resolved issues

Resolves ZAP-678

Documentation

N/A

Tests

Tested on some machines.

Previous behaviour:

• https://certification.canonical.com/hardware/202212-31024/submission/384021/test/176564/result/42874742/
• https://certification.canonical.com/hardware/202211-30885/submission/365364/test/176564/result/40446241/
• https://certification.canonical.com/hardware/202212-30973/submission/365373/test/176564/result/40447361/

Running from source:

Testing EDID cycling on HDMI-4
switching EDID to 1280x1024
PASS
switching EDID to 2560x1440
SKIP, max available was 2048x1152
switching EDID to 1920x1080
PASS

[codecov]

Codecov Report

Attention: Patch coverage is 91.07143% with 5 lines in your changes missing coverage. Please review.

Project coverage is 45.18%. Comparing base (7ab7c0f) to head (8c08ee4).
Report is 125 commits behind head on main.

Files with missing lines	Patch %	Lines
...box-support/checkbox_support/dbus/gnome_monitor.py	76.92%	2 Missing and 1 partial ⚠️
...heckbox-support/checkbox_support/monitor_config.py	81.81%	2 Missing ⚠️

Additional details and impacted files

@@            Coverage Diff             @@
##             main    #1393      +/-   ##
==========================================
+ Coverage   45.12%   45.18%   +0.05%     
==========================================
  Files         366      366              
  Lines       39058    39102      +44     
  Branches     6607     6609       +2     
==========================================
+ Hits        17626    17669      +43     
- Misses      20758    20760       +2     
+ Partials      674      673       -1     

Flag	Coverage Δ
checkbox-support	59.69% <89.36%> (+0.25%)	⬆️
provider-base	18.65% <100.00%> (+0.03%)	⬆️

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[Hook25]

See if you like the change proposed below but it makes sense