Use 2 decimal digits when showing runner queue time

The following discussion from !133683 (merged) should be addressed:

• @vshushlin started a discussion: (+1 comment)

  cc @mrincon now when we always return float, we'll almost always have numbers like 1.234(see on the screenshot). Maybe you want to address it on the frontend.

  We calculate this with the millisecond precision, that's why I round it up to 3 digits, but on UI it maybe useless.