fix: support slash-based branches and multi-dot filenames in URL parsing

[lwl2005]

Fixes #1940

Changes

1. GitHub URL Parsing - Support slash-based branches

• Changed regex from ([^\/]+) to (.+) for branch name matching
• Now correctly handles branches like feature/new-validation

2. File Extension Detection - Support multi-dot filenames

• Changed name.split('.')[1] to name.includes('.') ? name.split('.').pop() : ''
• Now correctly handles filenames like my.asyncapi.yaml (returns yaml instead of asyncapi)
• Gracefully handles files without extensions

Testing

• URLs like https://github.com/org/repo/blob/feature/new-validation/spec.yaml now parse correctly
• Filenames like my.asyncapi.yaml now detect extension as yaml
• Filenames without extensions no longer crash

[changeset-bot]

⚠️ No Changeset found

Latest commit: 100e99c

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[sonarqubecloud]

Quality Gate failed

Failed conditions
1 Security Hotspot

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