Use poetry package-mode=false

[carlcsaposs-canonical]

Added in poetry 1.8

(metadata unused since charm is not a Python package)

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 70.87%. Comparing base (7990f54) to head (e5b222c).
Report is 1 commits behind head on main.

Additional details and impacted files

@@           Coverage Diff           @@
##             main     #556   +/-   ##
=======================================
  Coverage   70.87%   70.87%           
=======================================
  Files          11       11           
  Lines        3021     3021           
  Branches      535      535           
=======================================
  Hits         2141     2141           
  Misses        764      764           
  Partials      116      116           

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[dragomirp]

The Juju 2 test_db failure should be handled by 7b7590d. Merging as is.