Improve flow UI

[Guilhem-lm]

4 changes here :

• The text of the iterator expression has been changed
• The original message displayed as an alert under the header has been move into the tootip of For loop
• Options have been gathered together
• The "Test an iteration" button has been moved to the top right before : after

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:rocket:	This description was created by Ellipsis for commit fc6dc554c875278b8131c4e13a4e815e131a0a07

Summary:

Improved the UI of the flow loop component by moving the alert message to a tooltip, gathering options into a new Settings tab, and repositioning the 'Test an iteration' button.

Key points:

• Updated frontend/src/lib/components/flows/content/FlowLoop.svelte to improve UI.
• Moved alert message to tooltip in the For loop header.
• Gathered options into a new Settings tab.
• Moved 'Test an iteration' button to the top right.
• Changed text for iterator expression tooltip.

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[Guilhem-lm]

@rubenfiszel I reverted the settings menu.