Include tvp scaling in contribution grid

[wd60622]

Description

Multiply out using xarray broadcasting

Related Issue

• Closes Time Varying Media not considered in channel_contributions_forward_pass #819
• Related to #

Checklist

• Checked that the pre-commit linting/style checks pass
• Included tests that prove the fix is effective or that the new feature works
• Added necessary documentation (docstrings and/or example notebooks)
• If you are a pro: each commit corresponds to a relevant logical change

Modules affected

• MMM
• CLV

Type of change

• New feature / enhancement
• Bug fix
• Documentation
• Maintenance
• Other (please specify):

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📚 Documentation preview 📚: https://pymc-marketing--1253.org.readthedocs.build/en/1253/

[wd60622]

Working on test right now. Thinking about what is the best way to check this... open to suggestions

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 95.65%. Comparing base (1d89f66) to head (ded485d).
Report is 2 commits behind head on main.

Additional details and impacted files

@@           Coverage Diff           @@
##             main    #1253   +/-   ##
=======================================
  Coverage   95.64%   95.65%           
=======================================
  Files          39       39           
  Lines        4091     4096    +5     
=======================================
+ Hits         3913     3918    +5     
  Misses        178      178           

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