fix(ci): don't report codecov on main #4910

Job	Run time
dojo-core-test	3m 35s
clippy	3m 49s
docs	3m 28s
dojo-spawn-and-move-example-test	3m 27s
dojo-world-bindings-check	2m 32s
ensure-wasm	1m 44s
fmt	1m 12s
ensure-windows	21m 30s
test	9m 35s
test-hurl	1m 27s
	52m 19s

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