Improve InstrumentRef parameter

[Jens Hedegaard Nielsen (jenshnielsen)]

Support looking up any Insturment as long as the name is know not just the same as the bound instrument

[codecov]

Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 69.32%. Comparing base (86273d9) to head (9488fc3).
⚠️ Report is 10 commits behind head on main.

Additional details and impacted files

@@ Coverage Diff @@## main #7922 +/- ##
==========================================
- Coverage 70.30% 69.32% -0.98% 
==========================================
Files 333 333 Lines 32401 32401 ==========================================
- Hits 22778 22462 -316 - Misses 9623 9939 +316 

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[Jens Hedegaard Nielsen (jenshnielsen)]

This requires changing root_instruments type to be Instrument | None rather than InstrumentBase which is correct and should be done anyway