WIP: Fix #15580 - Explicitly build BlueprintCircuits in QPY dump

[debasmita2102]

Fix Issue #15580 by adding a type-check for BlueprintCircuit in qiskit.qpy.interface.dump

AI/LLM disclosure

• I didn't use LLM tooling, or only used it privately.
• I used the following tool to help write this PR description:
• I used the following tool to generate or modify code:

[eliarbel]

Thanks Debasmita for addressing this. This is still in draft mode but I have a couple of comments which I think would help. The original motivation for this was to make sure accessing the _data attribute from Rust is safe, without needing a prior call to data() on the Rust side (which is this line:

qiskit/crates/circuit/src/converters.rs

Line 37 in ceba759

ob.getattr("data")?; // in case _data is lazily generated in python

). To this end:

1. Your PR branch is old and doesn't even contain the Rust QPY in it, so you'll need to either rebase it over upstream/main (assuming your qiskit remote is called upstream) or open a new PR over the current main.
2. We should call program._build() only if we're using the Rust circuit writer. So I would put the if isinstance(program, BlueprintCircuit) check here:

   qiskit/qiskit/qpy/binary_io/circuits.py

   Lines 1533 to 1534 in 1b0276a

   	if use_rust:
   	if annotation_factories is None: