Ignore common prefix weight for snapshots ordering

[arixmkii]

This is a bug fix to match the documented behavior in #2635

This also implies, that it will be allowed for snapshot versions to be updated to snapshots of different series.

For this to work reliably we need to eliminate weight of common prefix in allowPrereleases mode upgrading from Snapshot to Snapshot.

This is crucial, because in many projects (which publishes only snapshots for some reasons like continuous builds) there is no point to merge snapshots one by one sequentially.

Tests for these cases added.

[codecov]

Codecov Report

Merging #2707 (ccf9a68) into main (590f136) will increase coverage by 0.01%.
The diff coverage is 100.00%.

@@            Coverage Diff             @@
##             main    #2707      +/-   ##
==========================================
+ Coverage   80.68%   80.69%   +0.01%     
==========================================
  Files         146      146              
  Lines        2676     2678       +2     
  Branches       46       48       +2     
==========================================
+ Hits         2159     2161       +2     
  Misses        517      517              

Impacted Files	Coverage Δ
...ain/scala/org/scalasteward/core/data/Version.scala	100.00% <100.00%> (ø)

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[exoego]

LGTM