Throw consistent exceptions on \Drupal\migrate_plus\Plugin\migrate\process\SkipOnValue process plugin

Problem/Motivation

See parent issue for a detailed description.

Proposed resolution

Modify SkipOnValue process plugins to use InvalidArgumentException and to validate configuration in the constructor instead of ::tranform method.

Replace SkipOnValueTest::testRequiredProcessConfiguration and SkipOnValueTest::testRequiredRowConfiguration with generic testRequiredRowConfiguration because we throw error on Plugin contraction, so we don't need to check separate methods.