v2.0: reworks max number of outgoing push messages (backport of #3016… #10900

Job	Run time
check	2m 51s
cargo-test-sbf (token/program)	10m 24s
cargo-test-sbf (instruction-padding/program, token/program-2022, token/program-2022-test)	13m 52s
test (token/cli, token/program, token/program-2022, associated-token-account/program, instruction...	19m 39s
cargo-test-sbf (associated-token-account/program, associated-token-account/program-test)	12m 14s
test (single-pool/cli, single-pool/program)	19m 19s
cargo-test-sbf (token-upgrade/program)	10m 29s
test (token-upgrade/cli, token-upgrade/program)	17m 58s
cargo-test-sbf (feature-proposal/program)	10m 21s
cargo-test-sbf (governance/addin-mock/program, governance/program)	15m 4s
cargo-test-sbf (memo/program)	11m 48s
cargo-test-sbf (name-service/program)	7m 58s
cargo-test-sbf (stake-pool/program)	14m 27s
cargo-test-sbf (single-pool/program)	13m 34s
	2h 59m 58s

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