Import suggestion should filter out extension s

[bishabosha]

Minimized code

class A:                                                                                                         
  extension (s: String)
    def len: Int = s.length

object B extends A:
  def len(s: String): Int = s.length + 1

@main def Test =
  import B.len
  assert("abc".len == 4)

Output

// TODO add output here

Expectation

[nicolasstucki]

Same as #10231