fix: add explicit encoding='utf-8' to open() calls for Windows compat

[truecallerabreham]

Three open() calls in the codebase read text files without specifying an encoding. On Windows with non-UTF-8 locales (like GBK on Chinese Windows), this blows up with UnicodeDecodeError.

Added encoding=utf-8 to the two calls in the qdrant instrumentation __init__.py (loading the JSON method lists) and the one in generate_evaluator_models.py (reading the Swagger definition). That's it — three characters each, no behavioral change on systems that already default to UTF-8.

Existing tests cover the import path that triggers these reads, so passing tests confirms the fix works.

Closes #4286

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[coderabbitai]

📝 Walkthrough

Walkthrough

Two files are updated to add encoding="utf-8" to open() calls: the Qdrant instrumentation module now opens both sync and async JSON method definition files with explicit UTF-8 encoding, and the codegen script opens the Swagger spec with explicit UTF-8 encoding.

UTF-8 encoding fix

Layer / File(s)	Summary
Explicit UTF-8 encoding on open() calls packages/opentelemetry-instrumentation-qdrant/opentelemetry/instrumentation/qdrant/__init__.py, scripts/codegen/generate_evaluator_models.py	Adds encoding="utf-8" to open() calls when reading JSON/Swagger files, preventing UnicodeDecodeError on systems with non-UTF-8 default locales.

Estimated code review effort

🎯 1 (Trivial) | ⏱️ ~2 minutes

Poem

🐇 A rabbit once read a JSON file,
On Windows it crashed after a while!
"encoding='utf-8'!" I cried with glee,
Now every locale reads perfectly,
No more UnicodeError to revile! 🎉

🚥 Pre-merge checks | ✅ 5

✅ Passed checks (5 passed)

Check name	Status	Explanation
Title check	✅ Passed	The title clearly summarizes the main change: adding explicit UTF-8 encoding to open() calls for Windows compatibility.
Linked Issues check	✅ Passed	The changes match #4286 by adding encoding='utf-8' to the listed text-mode open() calls in both affected files.
Out of Scope Changes check	✅ Passed	The patch only touches the encoding of the targeted file reads and includes no unrelated code changes.
Docstring Coverage	✅ Passed	Docstring coverage is 100.00% which is sufficient. The required threshold is 80.00%.
Description Check	✅ Passed	Check skipped - CodeRabbit’s high-level summary is enabled.

✨ Finishing Touches

🧪 Generate unit tests (beta)

• Create PR with unit tests

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