Sorting the egl-generic rendering platform to the end of the list

[mattkae]

Fixes #3112

How to test

• Get access to an nvidia hybrid platform
• Run sudo XDG_RUNTIME_DIR=/run ./bin/mir_performance_tests --gtest_filter=GLMark2Wayland.* and it should all work

[codecov]

Codecov Report

Merging #3122 (78c0c60) into main (4c131c1) will decrease coverage by 0.04%.
Report is 10 commits behind head on main.
The diff coverage is 20.00%.

❗ Current head 78c0c60 differs from pull request most recent head 46d0f18. Consider uploading reports for the commit 46d0f18 to get more accurate results

@@            Coverage Diff             @@
##             main    #3122      +/-   ##
==========================================
- Coverage   77.84%   77.81%   -0.04%     
==========================================
  Files        1064     1064              
  Lines       74389    74418      +29     
==========================================
  Hits        57907    57907              
- Misses      16482    16511      +29     

Files	Coverage Δ
src/server/graphics/default_configuration.cpp	76.82% <20.00%> (-2.65%)	⬇️

... and 25 files with indirect coverage changes

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