include :: in name prefix check

[moshelooks]

import pymc as pm
with pm.Model("foo"):
    print(pm.Normal("foobar"), pm.Normal("baz"))

before: foobar foo::baz
after: foo::foobar foo::baz

What is this PR about?
...

Checklist

• Explain important implementation details 👆
• Make sure that the pre-commit linting/style checks pass.
• Link relevant issues (preferably in nice commit messages)
• Are the changes covered by tests and docstrings?
• Fill out the short summary sections 👇

Major / Breaking Changes

• ...

Bugfixes / New features

• The model name did not show up in the first RV name

Docs / Maintenance

• ...

[ferrine]

We need a missing test for that

[codecov]

Codecov Report

Merging #5951 (5660f00) into main (bc8e8cf) will decrease coverage by 0.00%.
The diff coverage is 100.00%.

@@            Coverage Diff             @@
##             main    #5951      +/-   ##
==========================================
- Coverage   89.54%   89.53%   -0.01%     
==========================================
  Files          73       73              
  Lines       13271    13271              
==========================================
- Hits        11883    11882       -1     
- Misses       1388     1389       +1     

Impacted Files	Coverage Δ
pymc/model.py	88.20% <100.00%> (ø)
pymc/step_methods/hmc/base_hmc.py	89.76% <0.00%> (-0.79%)	⬇️

[moshelooks]

We need a missing test for that

Added one.

[ferrine]

thank you!