Support a defined default time range

Is your feature request related to a problem?

When generating a new dashboard, I want to be able to control the default duration people will see when clicking into it the 1st time. Right now the default is always 30m. You can override that default manually via the UI or by adding a URL param, but for viewers of the dashboard the 1st time they see it will generally be via the "Dashboards" page, and 30m is inappropriate for some dashboards and can look broken/invalid.

Describe the solution you'd like

Set a default duration, which when left empty can still default to 30m, but when set will control the dashboard time window for a user who has not set any themselves. Caching once a user customizes their dashboard is not changed.

Describe alternatives you've considered

Trying to control the 1st access point to dashboards for all internal users via provided URLs with embedded relativeTime params, but that is cumbersome and impossible to enforce across the board.

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