scrubber: fix parsing issue with Azure

[arpad-m]

Apparently Azure returns timelines ending with / which confuses the parsing. So remove all trailing /s before attempting to parse.

Part of https://github.com/neondatabase/cloud/issues/19963

[github-actions]

5499 tests run: 5273 passed, 0 failed, 226 skipped (full report)

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Flaky tests (1)

Postgres 15

• test_cli_start_stop: release-arm64

Code coverage* (full report)

• functions: 31.5% (7937 of 25219 functions)
• lines: 49.6% (62966 of 126919 lines)

* collected from Rust tests only

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_{The comment gets automatically updated with the latest test results
4750f02 at 2024-11-19T04:45:32.613Z :recycle:}

[skyzh]

LGTM given it passes all tests (we run scrubber at the end of many tests) but I'm skeptical why this works 🤣