Update Transition A rule to a to accept PointMass distribution in VMP

[wouterwln]

[bvdmitri]

Hm why CI is not running on this PR??

[bvdmitri]

Started manually here https://github.com/ReactiveBayes/ReactiveMP.jl/actions/runs/11435244607

[codecov[bot]]

Codecov Report

All modified and coverable lines are covered by tests :white_check_mark:

Project coverage is 73.59%. Comparing base (9a705c8) to head (b3bba69). Report is 49 commits behind head on main.

Additional details and impacted files

@@            Coverage Diff             @@
##             main     #424      +/-   ##
==========================================
+ Coverage   72.56%   73.59%   +1.02%     
==========================================
  Files         190      195       +5     
  Lines        5493     5593     +100     
==========================================
+ Hits         3986     4116     +130     
+ Misses       1507     1477      -30     

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