Remove `parsoidsvc-*-parsertests-run-harder` jobs.

These jobs are now redundant with the `parsoidsvc-*-npm-*` jobs, which
are more easily configurable.

Depends on: I2d8e111da26d3f883cf7aba270847317724965e2

Change-Id: Ibe41601b9c94d9f5b9e6a9f6a2df7393c2378619