Revise `lavaan_rerun()` to note down reruns that failed to converge

[sfcheung]

To-Dos

• [x] Write a test for cases with failures to converge. (ee63358a94a37d1c5066b577f43a307e830cc57e)
• [x] Revise lavaan_reurn() to note down cases failed to converge. (d464f6764e695f1c1e4f3029416d296ea5bfdfd4)
• [x] Test lavaan_rerun(). (d464f6764e695f1c1e4f3029416d296ea5bfdfd4)
• [x] Update functions that will use post.check in processing the reruns to use converged too:
  • [x] est_change_raw() (9da8b79fef85d2dd8c099ccd04ffaa385d7cd456)
  • [x] est_change() (9da8b79fef85d2dd8c099ccd04ffaa385d7cd456)
  • [x] fit_measures_change() (9da8b79fef85d2dd8c099ccd04ffaa385d7cd456)
  • [x] print.lavaan_rerun() <- Do this in #27