fix: Dataflow analysis produces unsound results on Hugrs with entrypoint

[acl-cqc]

The bigger issue here is #2254, which this PR does not solve; it is a workaround.

However, it at least avoids unsoundness, by running the analysis on all nodes in the Hugr, rather than only those beneath the entrypoint. While this loses the ability to run analysis faster by restricting to within entry_descendants (that would be the full solution to #2254, not done here), it still

• allows using the entrypoint to identify the starting point to which inputs are fed in [Machine::run]
• provdes more accurate results than if we ran only within the subtree
• reduces memory after the analysis is complete (by returning only filtered results)

[codecov[bot]]

Codecov Report

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

Project coverage is 82.17%. Comparing base (ead071b) to head (6174928). Report is 3 commits behind head on main.

Additional details and impacted files

@@           Coverage Diff           @@
##             main    #2255   +/-   ##
=======================================
  Coverage   82.17%   82.17%           
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  Files         239      239           
  Lines       43012    43016    +4     
  Branches    38924    38928    +4     
=======================================
+ Hits        35346    35350    +4     
  Misses       5675     5675           
  Partials     1991     1991           

Flag	Coverage Δ
python	85.34% <ø> (ø)
rust	81.84% <100.00%> (+<0.01%)	:arrow_up:

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