Use current protocol version in MockEpochManager (#12304)

`KeyValueRuntime` creates a `MockEpochManager` which returns epoch infos
with protocol versions set to 1.
The fact that some tests run with protocol version 1, but still use
structs from the current protocol version messes up some checks that I'm
trying to add.
Let's use the current protocol version in the mock epoch info. Running
things with protocol version 1 isn't very realisitic anyway.

I had to fix one test which tests the "maintenance windows" feature -
the maintenance windows (heights where a specific validator is not a
block or chunk producer) were different in protocol version 1, I think
this is because the validator assignment algorithm has changed. I think
it's better to test the latest assignment algorithm.

I checked the new validator assignments by adding manual prints in the
`get_maintenance_windows` function.

chain/chain/src/test_utils/kv_runtime.rs

@@ -556,7 +556,7 @@ impl EpochManagerAdapter for MockEpochManager {
             HashMap::new(),
             1,
             1,
-            1,
+            PROTOCOL_VERSION,
             RngSeed::default(),
             Default::default(),
         )))

chain/client/src/tests/maintenance_windows.rs

@@ -24,18 +24,41 @@ fn test_get_maintenance_windows_for_validator() {
             GetMaintenanceWindows { account_id: "test".parse().unwrap() }.with_span_context(),
         );
 
-        // block_height: 0 bp: test         cps: [AccountId("test")]
-        // block_height: 1 bp: validator    cps: [AccountId("validator")]
-        // block_height: 2 bp: test         cps: [AccountId("test")]
-        // block_height: 3 bp: validator    cps: [AccountId("validator")]
-        // block_height: 4 bp: test         cps: [AccountId("test")]
-        // block_height: 5 bp: validator    cps: [AccountId("validator")]
-        // block_height: 6 bp: test         cps: [AccountId("test")]
-        // block_height: 7 bp: validator    cps: [AccountId("validator")]
-        // block_height: 8 bp: test         cps: [AccountId("test")]
-        // block_height: 9 bp: validator    cps: [AccountId("validator")]
+        // shard_ids: [ShardId(0)]
+        // #0
+        // block producer: test
+        // chunk producer for shard 0: other
+        // #1
+        // block producer: other
+        // chunk producer for shard 0: other
+        // #2
+        // block producer: other
+        // chunk producer for shard 0: test
+        // #3
+        // block producer: test
+        // chunk producer for shard 0: test
+        // #4
+        // block producer: other
+        // chunk producer for shard 0: other
+        // #5
+        // block producer: test
+        // chunk producer for shard 0: test
+        // #6
+        // block producer: test
+        // chunk producer for shard 0: other
+        // #7
+        // block producer: other
+        // chunk producer for shard 0: test
+        // #8
+        // block producer: other
+        // chunk producer for shard 0: test
+        // #9
+        // block producer: other
+        // chunk producer for shard 0: test
+        //
+        // Maintenance heights (heights where it's not a block or chunk producer) for test: 1, 4
         let actor = actor.then(|res| {
-            assert_eq!(res.unwrap().unwrap(), vec![1..2, 3..4, 5..6, 7..8, 9..10]);
+            assert_eq!(res.unwrap().unwrap(), [1..2, 4..5]);
             System::current().stop();
             future::ready(())
         });