Add restore troubleshooting for unknown transaction_timeout parameter

Clemens Beckrequested to merge
cb-restore-troubleshooting-docs into master

What does this MR do?

Add restore troubleshooting for unknown transaction_timeout parameter

If a PostgreSQL 16 server is backed up with our toolbox, users might see this error during restore, which is safe to ignore.

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  • Documentation created/updated.
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  • Equivalent MR/issue for omnibus-gitlab opened.

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Edited by Clemens Beck

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