Fixing index & type errors in prime_offload_tester.py (Bugfix)

[tomli380576]

Description

This PR fixes the issue in the Resolved Issues section and replaced some type annotations with ones supported in python 3.5

Resolved issues

If prime_offload_tester.py was run with arguments like python3 prime_offload_tester.py -d i915 -p 0000:00:02.0 and the command to check is glxgears, the test always passes because it was checking if "glxgears"[0] is one of the clients of this GPU. Since "glxgears"[0] == 'g', it always matches the g in "tgid" in /sys/kernel/debug/dri/<card_pci_id>/clients.

command  tgid dev master a   uid      magic
systemd-logind  1124   1   y    y     0          0
      Xwayland  3014 128   n    n  1000          0
 gsd-xsettings  3403 128   n    n  1000          0
          code  4943 128   n    n  1000          0
          code  4943 128   n    n  1000          0
          code  4943 128   n    n  1000          0
xdg-desktop-por  3317 128   n    n  1000          0

Now it will check if the entire string "glxgears" appears in the file

Documentation

Tests

Unit tests
Ran the script on 202408-34290 with -d i915 -p 0000:00:02.0 (Intel + NVIDIA desktop, expected to fail) and it correctly reports that prime offload didn't work

[codecov]

Codecov Report

Attention: Patch coverage is 93.75000% with 1 line in your changes missing coverage. Please review.

Project coverage is 48.00%. Comparing base (76d8f30) to head (81fe325).
Report is 1 commits behind head on main.

Files with missing lines	Patch %	Lines
providers/base/bin/prime_offload_tester.py	93.75%	1 Missing ⚠️

Additional details and impacted files

@@           Coverage Diff           @@
##             main    #1588   +/-   ##
=======================================
  Coverage   48.00%   48.00%           
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  Files         371      371           
  Lines       39833    39837    +4     
  Branches     6730     6730           
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+ Hits        19121    19125    +4     
  Misses      19994    19994           
  Partials      718      718           

Flag	Coverage Δ
provider-base	24.73% <93.75%> (+0.01%)	⬆️

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