feat(grouping): Add OpenStack Swift transaction ID parameterization

[JoshFerge]

Summary

• Adds a new swift_txn_id parameterization regex that matches OpenStack Swift transaction IDs
• Format: tx prefix + 21 lowercase hex chars + - + 10 lowercase hex char timestamp, with optional suffix
• Placed before the hex pattern to avoid the hex pattern partially matching components of Swift txn IDs

Swift Transaction ID Format

Real-world examples from OpenStack docs:

• tx274a77a8975c4a66aeb24-0052d95365
• tx69f60bc9f7634a01988e6-0052d9544b

Test plan

• Added test for base Swift transaction ID (34 chars)
• Added test for Swift txn ID embedded in a message
• Added test for Swift txn ID with cluster suffix
• Added negative test for non-tx prefix (falls through to hex matching)
• pytest -svv --reuse-db tests/sentry/grouping/test_parameterization.py — 202 passed