## Problem
The legacy Logs Explorer's Postgres Version Upgrade page (Database
Operations section) shows no results for most users. pg_upgrade_logs
rows aren't tagged with the project attribute the shared logs endpoint
scopes on, only a host field, so the project-scoped query returns
nothing even though the data exists.
## Fix
Hides the Database Operations sidebar section behind a new
showPostgresUpgradeLogs feature flag (default off), following the same
pattern as showMultigresLogs. The page route itself is untouched, only
the sidebar entry point is gated.
## How to test
- With the flag off, open the legacy Logs Explorer sidebar and confirm
the Database Operations section and Postgres Version Upgrade item are
gone
- With the flag on, confirm the section and item render as before
<!-- This is an auto-generated comment: release notes by coderabbit.ai
-->
## Summary by CodeRabbit
* **New Features**
* Added conditional access to Postgres Version Upgrade logs based on
feature availability.
* Failed Postgres upgrade notifications now show a “View logs” option
only when supported.
* **Bug Fixes**
* Prevented unsupported Postgres upgrade log links and navigation
options from appearing.
<!-- end of auto-generated comment: release notes by coderabbit.ai -->
