Fix falcon-instrumentation _handle_exception method to remove pylint disables

[srikaaviya]

Description

The _handle_exception method in the Falcon instrumentation had pylint warnings suppressed with inline disable comments (C0103, W0237, W1114) because a single method definition was trying to handle two different Falcon versions that have
different argument orders.

This change defines _handle_exception conditionally based on the detected Falcon version
at import time:

• For Falcon 1: _handle_exception(self, ex, req, resp, params) - matching the Falcon 1 base class signature
• For Falcon 2+: _handle_exception(self, req, resp, ex, params) - matching the Falcon 2+ base class signature

Since each version now uses the correct parameter names in the correct order, all three
pylint warnings are resolved without needing any disable comments.

Fixes #4198

Test:

• Existing Falcon instrumentation tests pass (35/41 — 6 pre-existing failures unrelated to this change)
• Pylint runs clean with no C0103, W0237, or W1114 warnings
• Pre-commit checks (ruff lint + format) pass

[linux-foundation-easycla]

The committers listed above are authorized under a signed CLA.

• ✅ login: srikaaviya / name: srikaaviya (3c99485)