Update upgrade-guide.mdx

[FelixMalfait]

Fix command

[greptile-apps]

PR Summary

Updated the upgrade guide for Twenty CRM, providing more detailed instructions for versions 0.22.0 and 0.23.0 upgrades.

• Added explanation for yarn command:prod workspace:sync-metadata -f in v0.22.0 upgrade
• Introduced new standard objects (Task and Notes) and deprecation of Activity object in v0.23.0 upgrade
• Added yarn command:prod workspace:sync-metadata -f step before running upgrade-0.23 command
• Clarified that upgrade-0.23 command handles data migration, including transferring activities to tasks/notes
• Emphasized the importance of backing up the database before starting the upgrade process

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