Sgmoore/kde neon ext updates

[ScarlettGatelyMoore]

• [x ] Have you followed the guidelines for contributing?
• [x ] Have you signed the CLA?
• Have you successfully run make lint?
• Have you successfully run pytest tests/unit?

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New content pack and set XDG_CONFIG_HOME for qt.conf

[codecov-commenter]

Codecov Report

Merging #4299 (bf9238d) into main (8758571) will not change coverage.
The diff coverage is 100.00%.

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@@           Coverage Diff           @@
##             main    #4299   +/-   ##
=======================================
  Coverage   89.08%   89.08%           
=======================================
  Files         300      300           
  Lines       20571    20571           
=======================================
  Hits        18325    18325           
  Misses       2246     2246           

Files Changed	Coverage Δ
snapcraft/extensions/kde_neon.py	100.00% <100.00%> (ø)

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[sergiusens]

Do you want to retarget this to the hotfix/7.5 branch for a speedier release?

[ScarlettGatelyMoore]

Do you want to retarget this to the hotfix/7.5 branch for a speedier release?

Yes, if it's not to late.

[sergiusens]

@ScarlettGatelyMoore it is not too late