Rename _replace_rvs_in_graphs and fix bug when replacing input

[ricardoV94]

This fix is needed for pymc-devs/pymc-extras#168

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📚 Documentation preview 📚: https://pymc--6720.org.readthedocs.build/en/6720/

[codecov]

Codecov Report

Merging #6720 (7dc7a82) into main (f632a34) will not change coverage.
The diff coverage is 100.00%.

Additional details and impacted files

@@           Coverage Diff           @@
##             main    #6720   +/-   ##
=======================================
  Coverage   91.99%   91.99%           
=======================================
  Files          95       95           
  Lines       16180    16180           
=======================================
  Hits        14885    14885           
  Misses       1295     1295           

Impacted Files	Coverage Δ
pymc/__init__.py	100.00% <100.00%> (ø)
pymc/backends/arviz.py	96.39% <100.00%> (ø)
pymc/backends/base.py	85.83% <100.00%> (ø)
pymc/backends/mcbackend.py	100.00% <100.00%> (ø)
pymc/backends/report.py	78.84% <100.00%> (ø)
pymc/distributions/simulator.py	87.23% <100.00%> (ø)
pymc/logprob/utils.py	100.00% <100.00%> (ø)
pymc/ode/ode.py	85.85% <100.00%> (ø)
pymc/pytensorf.py	92.60% <100.00%> (ø)
pymc/sampling/forward.py	95.45% <100.00%> (ø)
... and 6 more