[FEATURE] Add disable_auto_refresh config

[mixturesolutions]

Description

Adds an optional admin config flag to centrally disable dashboard auto-refresh, addressing perses/perses#4295

Default: false (no behavior change unless explicitly enabled)

When enabled:

• The auto-refresh interval dropdown is greyed out and non-interactive
• Tooltip: “Auto-refresh has been turned off by your administrator.”
• Dashboard refreshInterval and ?refresh= URL param are ignored
• Follows the same pattern as disable_custom and disable_zoom

Note this is linked with another PR in the main perses repo

Screenshots

To enable, change in the respective perses config yaml file like the following:

Once the changes are deployed, config page will reflect the changes and the dashboard ui will look like:

Checklist

• Pull request has a descriptive title and context useful to a reviewer.
• Pull request title follows the [<catalog_entry>] <commit message> naming convention using one of the
  following catalog_entry values: FEATURE, ENHANCEMENT, BUGFIX, BREAKINGCHANGE, DOC,IGNORE.
• All commits have DCO signoffs.

UI Changes

• Changes that impact the UI include screenshots and/or screencasts of the relevant changes.
• Code follows the UI guidelines.
• E2E tests are stable and unlikely to be flaky.
  See e2e docs for more details. Common issues include:
  • Is the data inconsistent? You need to mock API requests.
  • Does the time change? You need to use consistent time values or mock time utilities.
  • Does it have loading states? You need to wait for loading to complete.