v2.1: Store epoch in MaxAge (backport of #3485) #12793

Job	Run time
cargo-test-sbf (token/program)	10m 13s
check	2m 50s
cargo-test-sbf (instruction-padding/program, token/program-2022, token/program-2022-test)	19m 11s
cargo-test-sbf (associated-token-account/program, associated-token-account/program-test)	9m 47s
test (token/cli, token/program, token/program-2022, associated-token-account/program, instruction...	19m 49s
cargo-test-sbf (token-upgrade/program)	9m 29s
test (single-pool/cli, single-pool/program)	19m 19s
cargo-test-sbf (feature-proposal/program)	9m 39s
test (token-upgrade/cli, token-upgrade/program)	15m 13s
cargo-test-sbf (governance/addin-mock/program, governance/program)	12m 38s
cargo-test-sbf (memo/program)	10m 44s
cargo-test-sbf (name-service/program)	10m 50s
cargo-test-sbf (stake-pool/program)	12m 56s
cargo-test-sbf (single-pool/program)	10m 8s
	2h 52m 46s

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