Bids 3184/restructure validator dashboard header

[MauserBitfly]

This PR

• changes the arrangement of the dashboard header and control rows.
  • changes the create new dashboard button to secondary
  • moves some buttons from the dashboard header to the control row
  • combines dashboard configuration buttons into one settings menu
  • changing the label of the Dashboard selections to Validators / Accounts instead of the selected name
  • adds the global Rocket Pool (RP) Switch to the settings - currently disabled in production.
• creates a BcMenuBar component wrapping the Primevue Menubarto be used in the header and control row
  • changes the default style for the menu bar and uses the previous style only for highlighted menu bar items
• uses the secondary button style for the content filter button

This PR:

• does not change the logic when buttons are shown only where and how.

[cloudflare-workers-and-pages]

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[benji-bitfly]

LGTM 🚀