[FSSDK-12879] Remove Karma testing infrastructure #1603

Job	Run time
unit_tests (18)	1m 34s
typescript_test	1m 41s
lint	1m 2s
unit_tests (22)	1m 24s
commonjs_test	1m 37s
browser_tests (firefox)	48s
browser_tests (chrome)	46s
fullstack_production_suite / test	8s
unit_tests (20)	1m 34s
browser_tests (safari)	46s
lint_markdown_files / lint	1m 2s
integration_tests / test	7s
unit_tests (24)	1m 25s
browser_tests (edge)	43s
Coveralls coverage	4s
	14m 41s

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