perf(minifier): avoid creation of unnecessary conditional expressions (#25931)

I started reviewing `minimize_conditional_expression` and looks like
there is alot of wasted effort there, esp, when we are re-creating
`ConditionalExpression` recursively by calling `minimize_conditional`,
for now i decided to only optimize `!==` and `!`, but folding of
`SequenceExpression` and creation of all new
`Expression::new_conditional_expression` could be removed as we should
just mutate current expression