Closes#844, closes#839
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### Summary by CodeRabbit
- New Feature: Added a `logOut` function to the user context for
improved logout handling.
- Refactor: Updated the redirect path in the `SignInForm` component for
better user redirection after authentication.
- New Feature: Enhanced the "Add" button and "Connect new" menu item in
`CredentialsDropdown` with role-based access control.
- Refactor: Replaced the `signOut` function with the `logOut` function
from the `useUser` hook in `DashboardHeader`.
- Bug Fix: Prevented execution of certain code blocks in
`TypebotProvider` when `typebotData` is read-only.
- Refactor: Optimized the `handleObserver` function in `ResultsTable`
with a `useCallback` hook.
- Bug Fix: Improved router readiness check in `WorkspaceProvider` to
prevent premature execution of certain operations.
<!-- end of auto-generated comment: release notes by coderabbit.ai -->
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