Retrieve labdir from container labels during destroy

[steiler]

We where always expecting the labdir to be a subdir of the actual pwd. With this PR we will query the labels and deduce the labdir from the "containerlab" label.

Fixing #1737

[hellt]

Thanks for checking this out! Mark it ready when you are.
May be a need for 0.48.4 :D

[codecov]

Codecov Report

Merging #1738 (62f8290) into main (c02c840) will decrease coverage by 0.02%.
Report is 1 commits behind head on main.
The diff coverage is 77.21%.

Additional details and impacted files

@@            Coverage Diff             @@
##             main    #1738      +/-   ##
==========================================
- Coverage   51.87%   51.85%   -0.02%     
==========================================
  Files         143      143              
  Lines       13845    13898      +53     
==========================================
+ Hits         7182     7207      +25     
- Misses       5864     5883      +19     
- Partials      799      808       +9     

Files	Coverage Δ
clab/config.go	66.83% <100.00%> (ø)
utils/file.go	54.91% <100.00%> (+0.61%)	⬆️
types/topo_paths.go	69.42% <57.14%> (-1.02%)	⬇️
cmd/destroy.go	67.50% <77.61%> (-2.57%)	⬇️

... and 3 files with indirect coverage changes