refactor: forester: add default tree / epoch #914

Job	Run time
system-programs (token test, ["cargo-test-sbf -p sdk-token-test"])	6m 8s
system-programs (anchor & pinocchio, ["cargo-test-sbf -p sdk-anchor-test", "cargo-test-sbf -p sdk...	10m 30s
system-programs (sdk-libs, light-sdk-macros light-sdk light-program-test light-client light-ctoke...	6m 1s
system-programs (native, ["cargo-test-sbf -p sdk-native-test", "cargo-test-sbf -p sdk-v1-native-t...	9m 2s
	31m 41s

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