v2.1: Store epoch in MaxAge (backport of #3485) #12791

Job	Run time
cargo-test-sbf (token/program)	15m 35s
cargo-test-sbf (instruction-padding/program, token/program-2022, token/program-2022-test)	17m 4s
test (token/cli, token/program, token/program-2022, associated-token-account/program, instruction...	17m 56s
check	2m 57s
test (single-pool/cli, single-pool/program)	17m 38s
cargo-test-sbf (associated-token-account/program, associated-token-account/program-test)	10m 10s
test (token-upgrade/cli, token-upgrade/program)	17m 56s
cargo-test-sbf (token-upgrade/program)	8m 57s
cargo-test-sbf (feature-proposal/program)	10m 44s
cargo-test-sbf (governance/addin-mock/program, governance/program)	13m 53s
cargo-test-sbf (memo/program)	8m 4s
cargo-test-sbf (name-service/program)	10m 55s
cargo-test-sbf (stake-pool/program)	13m 24s
cargo-test-sbf (single-pool/program)	11m 50s
	2h 57m 3s

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