Add `force` option to lxd `stop` request on error

[sharder996]

If lxd fails to stop an instance gracefully, retry the request with the force option applied.

Fixes #2492

[codecov[bot]]

Codecov Report

Merging #2693 (2e68de8) into main (ef0aa14) will increase coverage by 0.00%. The diff coverage is 100.00%.

@@           Coverage Diff           @@
##             main    #2693   +/-   ##
=======================================
  Coverage   86.51%   86.51%           
=======================================
  Files         217      217           
  Lines       10899    10902    +3     
=======================================
+ Hits         9429     9432    +3     
  Misses       1470     1470           

Impacted Files	Coverage Δ
src/platform/backends/lxd/lxd_virtual_machine.cpp	90.21% <100.00%> (+0.16%)	:arrow_up:

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