runtime checks for rent_epoch (#5629)

* runtime checks for rent_epoch

* add actual test

* bigger timeout

* backout 90 min timeout

* new noop

sdk/src/instruction.rs

@@ -64,6 +64,9 @@ pub enum InstructionError {
     /// Executable bit on account changed, but shouldn't have
     ExecutableModified,
 
+    /// Rent_epoch account changed, but shouldn't have
+    RentEpochModified,
+
     /// CustomError allows on-chain programs to implement program-specific error types and see
     /// them returned by the Solana runtime. A CustomError may be any type that is represented
     /// as or serialized to a u32 integer.