[FSSDK-12879] Remove Karma testing infrastructure #1604

Job	Run time
unit_tests (22)	1m 35s
unit_tests (24)	1m 29s
browser_tests (edge)	5m 18s
lint	1m 2s
browser_tests (chrome)	7m 25s
integration_tests / test	9s
commonjs_test	1m 39s
unit_tests (18)	1m 41s
lint_markdown_files / lint	59s
browser_tests (safari)	3m 46s
typescript_test	1m 40s
fullstack_production_suite / test	7s
browser_tests (firefox)	6m 17s
unit_tests (20)	1m 39s
Coveralls coverage	5s
	34m 51s

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