Fix issue #16097 - Fix qasm3.dumps_experimental delay units

[pedro2mj]

AI/LLM disclosure

• I didn't use LLM tooling, or only used it privately.
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[mtreinish]

This change looks correct to me, thanks for fixing it. But before we merge it could you add a test that covers these fixes. Additionally, could you add a release note for the fix. The process for this is documented here: https://github.com/Qiskit/qiskit/blob/main/CONTRIBUTING.md#release-notes

[coveralls]

Coverage Report for CI Build 25164307073

Warning

Build has drifted: This PR's base is out of sync with its target branch, so coverage data may include unrelated changes.
Quick fix: rebase this PR. Learn more →

Coverage increased (+0.02%) to 87.583%

Details

• Coverage increased (+0.02%) from the base build.
• Patch coverage: 2 uncovered changes across 2 files (0 of 2 lines covered, 0.0%).
• 7 coverage regressions across 3 files.

Uncovered Changes

File	Changed	Covered	%
crates/qasm3/src/ast.rs	1	0	0.0%
crates/qasm3/src/exporter.rs	1	0	0.0%

Coverage Regressions

7 previously-covered lines in 3 files lost coverage.

File	Lines Losing Coverage	Coverage
crates/qasm2/src/lex.rs	5	91.52%
crates/circuit/src/parameter/parameter_expression.rs	1	90.53%
crates/qasm2/src/expr.rs	1	93.82%

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Coverage Stats

Relevant Lines:	121251
Covered Lines:	106195
Line Coverage:	87.58%
Coverage Strength:	964696.81 hits per line

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💛 - Coveralls