fix(runner): some minor fixes and improvements

[ihexxa]

Changes

• Settings' layout sometimes wrapped.
• Save last settings (iteration, delay, and data)
• Hide the alert modal and display error message in the console

Ref: INS-4366

[jackkav]

I'd prefer not to use for var i loops. If you have some more energy for it I'd like you to take another pass, if not you can merge it but it will be inconsistent.
In one of the review comments you said you have plans to refactor this soon, in future please link to the ticket or the work you propose to refactor it as part of. The idea here is that when we scope things out we aren't dismissing the comment entirely just pushing it into a different PR.

TLDR: use functional style where possible, unless processing a list thousands of items.

[ihexxa]

Update: The "reset" button is removed according to the request.
And the ticket for tracking: INS-4374