Use Bob to spell check the release notes

[1ucian0]

Adds a workflow that uses Bob to spell- and grammar-check release notes.

When one or more release notes are included in a PR, the following prompt runs with those release note files:

Correct spelling and grammar of @<files>. If possible, avoid redundancies and repetitions.

If Bob has feedback, @github-actions submits a comment review with suggestions. Check out this example: 1ucian0#83 (review) :

---

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:

Well... none of these. However, the script downloads the latest version of BobShell and makes a release note suggestion.

[qiskit-bot]

One or more of the following people are relevant to this code:

• @Qiskit/terra-core

[coveralls]

Coverage Report for CI Build 25068141599

Coverage increased (+0.005%) to 87.571%

Details

• Coverage increased (+0.005%) from the base build.
• Patch coverage: No coverable lines changed in this PR.
• 17 coverage regressions across 6 files.

Uncovered Changes

No uncovered changes found.

Coverage Regressions

17 previously-covered lines in 6 files lost coverage.

File	Lines Losing Coverage	Coverage
crates/qasm2/src/lex.rs	6	90.75%
crates/qasm2/src/parse.rs	6	97.15%
crates/circuit/src/parameter/symbol_expr.rs	2	74.25%
crates/circuit/src/parameter/parameter_expression.rs	1	90.53%
crates/qasm2/src/expr.rs	1	93.82%
crates/transpiler/src/passes/unitary_synthesis/decomposers.rs	1	94.71%

---

Coverage Stats

Relevant Lines:	119917
Covered Lines:	105012
Line Coverage:	87.57%
Coverage Strength:	978522.46 hits per line

---

💛 - Coveralls

[1ucian0]

By team suggestion, I need to move this feature as opt-in via a label, so moving it to draft