🚸 Accept None in connect() and improve migration dialogue

[falexwolf]

Addresses:

• ln.connect() should accept None #948

Also improves the migration dialogue when instance version and package version mismatch.

[codecov]

Codecov Report

Attention: Patch coverage is 84.61538% with 4 lines in your changes missing coverage. Please review.

Project coverage is 83.91%. Comparing base (d1969b1) to head (c107689).
Report is 3 commits behind head on main.

Files with missing lines	Patch %	Lines
lamindb_setup/_connect_instance.py	83.33%	4 Missing ⚠️

Additional details and impacted files

@@            Coverage Diff             @@
##             main     #947      +/-   ##
==========================================
+ Coverage   83.75%   83.91%   +0.15%     
==========================================
  Files          43       43              
  Lines        3472     3469       -3     
==========================================
+ Hits         2908     2911       +3     
+ Misses        564      558       -6     

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[github-actions]

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