docs: add documentation new retry mode for retry rules

[Syffe]

We now support the use of the retry mode attribute for retry rules. This introduce the first documentation on how to use it.

Related MRGFY-6341

[mergify]

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[Copilot]

Pull request overview

This PR adds initial documentation for the new retry mode attribute in Auto-Retry rules, which allows users to configure whether retries should re-run only failed jobs or the entire workflow.

Changes:

• Updated the workflow retry step description to reflect the two retry modes
• Added documentation for the retry mode configuration option in retry rules

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