v2.0: Store epoch in MaxAge (backport of #3485) #12790

Job	Run time
cargo-test-sbf (token/program)	10m 18s
cargo-test-sbf (instruction-padding/program, token/program-2022, token/program-2022-test)	16m 20s
check	5m 13s
cargo-test-sbf (associated-token-account/program, associated-token-account/program-test)	12m 16s
test (token/cli, token/program, token/program-2022, associated-token-account/program, instruction...	17m 53s
test (single-pool/cli, single-pool/program)	17m 36s
test (token-upgrade/cli, token-upgrade/program)	17m 52s
cargo-test-sbf (token-upgrade/program)	10m 39s
cargo-test-sbf (feature-proposal/program)	9m 21s
cargo-test-sbf (governance/addin-mock/program, governance/program)	14m 42s
cargo-test-sbf (memo/program)	12m 13s
cargo-test-sbf (name-service/program)	10m 26s
cargo-test-sbf (stake-pool/program)	14m 49s
cargo-test-sbf (single-pool/program)	11m 36s
	3h 1m 14s

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