v2.0: reworks max number of outgoing push messages (backport of #3016) #10884

Job	Run time
cargo-test-sbf (token/program)	11m 8s
cargo-test-sbf (instruction-padding/program, token/program-2022, token/program-2022-test)	17m 24s
cargo-test-sbf (associated-token-account/program, associated-token-account/program-test)	12m 22s
cargo-test-sbf (token-upgrade/program)	12m 12s
check	4m 49s
cargo-test-sbf (feature-proposal/program)	10m 15s
cargo-test-sbf (governance/addin-mock/program, governance/program)	15m 29s
test (token/cli, token/program, token/program-2022, associated-token-account/program, instruction...	20m 28s
cargo-test-sbf (memo/program)	10m 39s
test (single-pool/cli, single-pool/program)	20m 33s
cargo-test-sbf (name-service/program)	11m 8s
test (token-upgrade/cli, token-upgrade/program)	19m 6s
cargo-test-sbf (stake-pool/program)	14m 4s
cargo-test-sbf (single-pool/program)	11m 38s
	3h 11m 15s

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