mysql_user: add correct ed25519 plugin handling when creating a user

[Andersson007]

SUMMARY

Fixes #672

[Andersson007]

ready for review

[codecov]

Codecov Report

Attention: Patch coverage is 0% with 1 line in your changes missing coverage. Please review.

Project coverage is 64.79%. Comparing base (37a718c) to head (93b9554).
Report is 5 commits behind head on main.

Files with missing lines	Patch %	Lines
plugins/module_utils/user.py	0.00%	1 Missing ⚠️

❗ There is a different number of reports uploaded between BASE (37a718c) and HEAD (93b9554). Click for more details.

HEAD has 8 uploads less than BASE

Flag	BASE (37a718c)	HEAD (93b9554)
integration	12	4

Additional details and impacted files

@@             Coverage Diff             @@
##             main     #674       +/-   ##
===========================================
- Coverage   76.31%   64.79%   -11.52%     
===========================================
  Files          20       17        -3     
  Lines        2651     2599       -52     
  Branches      676      672        -4     
===========================================
- Hits         2023     1684      -339     
- Misses        427      696      +269     
- Partials      201      219       +18     

Flag	Coverage Δ
integration	64.79% <0.00%> (-10.88%)	⬇️

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[Andersson007]

@markuman thanks for reviewing!