fix(package paths): fixed auto-generated package paths to make them unique (#1401)

[spaulins-usgs]

No description provided.

[codecov]

Codecov Report

Merging #1425 (15c563e) into develop (ce51469) will decrease coverage by 45.906%.
The diff coverage is 54.545%.

@@              Coverage Diff               @@
##           develop     #1425        +/-   ##
==============================================
- Coverage   75.931%   30.024%   -45.907%     
==============================================
  Files          249       249                
  Lines        52268     52170        -98     
==============================================
- Hits         39688     15664     -24024     
- Misses       12580     36506     +23926     

Impacted Files	Coverage Δ
flopy/mf6/mfmodel.py	46.347% <50.000%> (-37.786%)	⬇️
flopy/mf6/mfbase.py	60.053% <57.142%> (-26.012%)	⬇️
flopy/mf6/utils/testutils.py	0.000% <0.000%> (-93.334%)	⬇️
flopy/mfusg/mfusgsms.py	6.190% <0.000%> (-91.474%)	⬇️
flopy/mf6/utils/postprocessing.py	9.259% <0.000%> (-88.889%)	⬇️
flopy/modflow/mfevt.py	7.317% <0.000%> (-87.829%)	⬇️
flopy/mf6/utils/lakpak_utils.py	2.097% <0.000%> (-85.315%)	⬇️
flopy/modflow/mfhyd.py	13.223% <0.000%> (-85.124%)	⬇️
flopy/utils/swroutputfile.py	10.714% <0.000%> (-85.079%)	⬇️
flopy/utils/mtlistfile.py	4.620% <0.000%> (-84.700%)	⬇️
... and 143 more