[release-17.0] Remove FOSSA Test from CI until we can do it in a secure way (#14119)

[vitess-bot]

Description

This is a backport of #14119

[vitess-bot]

Review Checklist

Hello reviewers! 👋 Please follow this checklist when reviewing this Pull Request.

General

• Ensure that the Pull Request has a descriptive title.
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Tests

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Backward compatibility

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