Ignore errors in rmtree

[BjarneHerland]

Resolves #3153

This fails sometimes due to the suspected/known race where block_fs removes lockfiles on GC, which may or may not run in parallel with rmtree.

[sondreso]

LGTM!

[codecov-commenter]

Codecov Report

Merging #3155 (20b6476) into main (32b4350) will decrease coverage by 0.48%.
The diff coverage is n/a.

@@            Coverage Diff             @@
##             main    #3155      +/-   ##
==========================================
- Coverage   65.75%   65.27%   -0.49%     
==========================================
  Files         651      612      -39     
  Lines       50635    49262    -1373     
  Branches     4445     4445              
==========================================
- Hits        33296    32155    -1141     
+ Misses      15847    15617     -230     
+ Partials     1492     1490       -2     

Impacted Files	Coverage Δ
ert_gui/ertwidgets/searchbox.py	33.33% <0.00%> (-22.92%)	⬇️
...ed/ide/keywords/definitions/argument_definition.py	90.00% <0.00%> (-10.00%)	⬇️
libres/lib/analysis/ies/ies.cpp	60.11% <0.00%> (-5.55%)	⬇️
libres/lib/analysis/ies/ies_config.cpp	80.00% <0.00%> (-4.13%)	⬇️
.../ertwidgets/models/analysismodulevariablesmodel.py	56.81% <0.00%> (-0.63%)	⬇️
res/job_queue/queue.py	84.59% <0.00%> (-0.32%)	⬇️
ert_gui/gert_main.py	96.00% <0.00%> (-0.11%)	⬇️
ert_shared/ide/keywords/data/__init__.py	100.00% <0.00%> (ø)
ert_shared/ide/keywords/definitions/__init__.py	100.00% <0.00%> (ø)
libres/lib/include/ert/analysis/ies/ies_data.hpp	0.00% <0.00%> (ø)
... and 47 more

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