disable codecov #276

Job	Run time
tests (stable)	1m 48s
tests (nightly)	1m 31s
test-executors-misc-features (stable, ws-no-park)	1m 43s
cargo clippy	42s
test-executors-misc-features (stable, thread-pinning)	1m 43s
cargo fmt	16s
test-executors-misc-features (stable, numa-aware)	1m 44s
test-executors-no-ws-timed-fairness (stable)	1m 39s
test-executors-misc-features (stable, produce-metrics)	1m 44s
test-executors-misc-features (nightly, ws-no-park)	1m 37s
test-executors-no-ws-timed-fairness (nightly)	1m 36s
test-executors-misc-features (nightly, thread-pinning)	1m 37s
test-executors-misc-features (nightly, numa-aware)	1m 31s
test-executors-misc-features (nightly, produce-metrics)	1m 35s
	20m 46s

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