[v0.13] Backport #4060 to v2.12.5

[Copilot]

• [x] Understand PR #4060 changes (fixes for Azure DevOps webhooks with spaces and old URL formats)
• [x] Apply changes to pkg/webhook/webhook.go (fix URL parsing with EscapedPath and Azure DevOps URL format conversion)
• [x] Apply changes to pkg/webhook/webhook_test.go (add new test cases for URL spacing and matching)
• [x] Run existing tests to verify the changes work correctly
• [x] Run linters and builds to ensure code quality
• [ ] Security check with CodeQL
• [ ] Code review

Original prompt

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This section details on the original issue you should resolve

<issue_title>Backport #4060 to v2.12.5</issue_title> <issue_description>Backport https://github.com/rancher/fleet/pull/4060 to v2.12.5</issue_description>

<agent_instructions>Put a "[v0.13] " in front of the pr title.</agent_instructions>

Comments on the Issue (you are @copilot in this section)

• Fixes rancher/fleet#4298

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[thardeck]

Waiting for release