CC-1202: add tsconfig.json to TS repos #251

Job	Run time
test_course_definition / go_lint	2s
test_course_definition / identify_language_slugs	3s
test_course_definition / docker_lint	7s
test_course_definition / markdown_lint	24s
test_course_definition / js_lint	24s
test_course_definition / rust_lint	6s
test_course_definition / validate-schemas	19s
test_course_definition / validate-stages-naming	8s
test_course_definition / verify_templates_compiled	21s
test_course_definition / test (cpp)	45s
test_course_definition / test (csharp)	1m 8s
test_course_definition / test (go)	41s
test_course_definition / test (haskell)	1m 50s
test_course_definition / test (javascript)	24s
test_course_definition / test (python)	33s
test_course_definition / test (ruby)	23s
test_course_definition / test (rust)	45s
test_course_definition / test (typescript)	59s
	9m 22s

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