ci/helpers: Add Expect{DoesNot,}ContainsFilterLine
ci/helpers: Add Expect{DoesNot,}ContainsFilterLine

ExpectContainsFilterLine applies the provided JSONPath filter to each
line of stdout of the executed command and asserts that the expected
string matches at least one of the lines.

ExpectDoesNotContainFilterLine asserts that the expected line does not
occur in the output.

Signed-off-by: Sebastian Wicki <db043b2055cb3a47b2eb0b5aebf4e114a8c24a5a@isovalent.com>

cilium/cilium,tgraf/cilium,tgraf/cilium,tgraf/cilium,tklauser/cilium,michi-covalent/cilium,cilium/cilium,michi-covalent/cilium,tklauser/cilium,cilium/cilium,tgraf/cilium,cilium-team/cilium,michi-covalent/cilium,cilium-team/cilium,michi-covalent/cilium,tklauser/cilium,michi-covalent/cilium,tgraf/cilium,tklauser/cilium,cilium/cilium,tgraf/cilium,tklauser/cilium,cilium/cilium