[FSSDK-12879] Remove Karma testing infrastructure #1605

Job	Run time
unit_tests (18)	1m 17s
lint_markdown_files / lint	56s
browser_tests (edge)	7m 19s
commonjs_test	1m 36s
unit_tests (22)	1m 36s
unit_tests (20)	1m 33s
unit_tests (24)	1m 16s
browser_tests (safari)	7m 41s
fullstack_production_suite / test	6s
typescript_test	1m 35s
lint	52s
integration_tests / test	8s
browser_tests (chrome)	8m 3s
browser_tests (firefox)	8m 20s
Coveralls coverage	4s
	42m 22s

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