Zitadel upgrades

Version-specific upgrade pages for self-hosted Zitadel major releases.

Zitadel v3 to v4 upgrade

Upgrading self-hosted Zitadel from v3 to v4: running setup before the new runtime, moving integrations off deprecated v1 endpoints to the v2 APIs, testing Login V2 with custom branding, and deciding on Service Ping.

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