fix(ci): don't report codecov on main (#1575) #4911

Job	Run time
dojo-core-test	3m 37s
docs	3m 35s
clippy	3m 25s
dojo-spawn-and-move-example-test	3m 24s
dojo-world-bindings-check	2m 16s
ensure-wasm	1m 34s
ensure-windows	23m 53s
fmt	1m 5s
test	9m 18s
test-hurl	6m 4s
	58m 11s

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