feat: Deprecate local find_tuple_unpack rewrite

[aborgna-q]

We moved the untuple rewrite into a hugr pass (https://docs.rs/hugr/latest/hugr/algorithms/struct.UntuplePass.html), but never removed it from here.

[codecov]

Codecov Report

❌ Patch coverage is 0% with 1 line in your changes missing coverage. Please review.
✅ Project coverage is 78.63%. Comparing base (ab3e020) to head (331f577).
⚠️ Report is 2 commits behind head on main.

Files with missing lines	Patch %	Lines
tket/src/passes/pytket.rs	0.00%	0 Missing and 1 partial ⚠️

Additional details and impacted files

@@            Coverage Diff             @@
##             main    #1188      +/-   ##
==========================================
- Coverage   78.70%   78.63%   -0.08%     
==========================================
  Files         151      151              
  Lines       18262    18259       -3     
  Branches    17172    17169       -3     
==========================================
- Hits        14374    14358      -16     
- Misses       3011     3020       +9     
- Partials      877      881       +4     

Flag	Coverage Δ
python	92.65% <ø> (ø)
qis-compiler	68.82% <ø> (ø)
rust	78.17% <0.00%> (-0.08%)	⬇️

Flags with carried forward coverage won't be shown. Click here to find out more.

☔ View full report in Codecov by Sentry.
📢 Have feedback on the report? Share it here.

🚀 New features to boost your workflow:

• ❄️ Test Analytics: Detect flaky tests, report on failures, and find test suite problems.