compute_log_prior: make subsequent arguments keyword only

[vkverma9534]

I closed the previous PR (#8122) prematurely while trying to resolve pre-commit autofix failures, which ended up being a distraction from the actual change.

This PR keeps things minimal and focused: it enforces keyword-only arguments for compute_log_prior, aligning its signature with compute_log_likelihood and preventing accidental positional argument usage.

As requested in the earlier discussion, the test case has been removed and only the signature fix remains.

[read-the-docs-community]

Documentation build overview

📚 pymc | 🛠️ Build #31568627 | 📁 Comparing be882c3 against latest (9d6f6c1)

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Show files changed (4 files in total): 📝 4 modified | ➕ 0 added | ➖ 0 deleted

File	Status
glossary.html	📝 modified
api/misc.html	📝 modified
api/generated/pymc.compute_log_prior.html	📝 modified
_modules/pymc/stats/log_density.html	📝 modified

[vkverma9534]

Although by the test (in #8122 ) it was evident that compute_log_prior was not enforcing keyword-only arguments, the test failed prior to the signature fix and passed once the arguments were made keyword-only.

[codecov]

Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 91.50%. Comparing base (9d6f6c1) to head (be882c3).
⚠️ Report is 3 commits behind head on main.

Additional details and impacted files

@@           Coverage Diff           @@
##             main    #8123   +/-   ##
=======================================
  Coverage   91.50%   91.50%           
=======================================
  Files         123      123           
  Lines       19821    19821           
=======================================
  Hits        18137    18137           
  Misses       1684     1684           

Files with missing lines	Coverage Δ
pymc/stats/log_density.py	97.36% <ø> (ø)

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[vkverma9534]

Thanks @aloctavodia @ricardoV94