Update multiple PING commands stage in course definition #910

Job	Run time
test_course_definition / identify_language_slugs	4s
test_course_definition / js_lint	13s
test_course_definition / go_lint	3s
test_course_definition / docker_lint	10s
test_course_definition / lint	53s
test_course_definition / markdown_lint	14s
test_course_definition / rust_lint	5s
test_course_definition / validate-schemas	13s
test_course_definition / validate-stages-naming	5s
test_course_definition / verify_templates_compiled	21s
test_course_definition / test (c)	41s
test_course_definition / test (clojure)	1m 58s
test_course_definition / test (cpp)	1m 56s
test_course_definition / test (crystal)	57s
test_course_definition / test (csharp)	1m 13s
test_course_definition / test (elixir)	49s
test_course_definition / test (gleam)	56s
test_course_definition / test (go)	1m 7s
test_course_definition / test (haskell)	2m 50s
test_course_definition / test (java)	2m 1s
test_course_definition / test (javascript)	45s
test_course_definition / test (kotlin)	2m 38s
test_course_definition / test (ocaml)	6m 22s
test_course_definition / test (php)	53s
test_course_definition / test (python)	37s
test_course_definition / test (ruby)	45s
test_course_definition / test (rust)	1m 45s
test_course_definition / test (scala)	3m 49s
test_course_definition / test (swift)	4m 4s
test_course_definition / test (typescript)	1m 19s
test_course_definition / test (zig)	1m 27s
	41m 13s

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