RollingSessionWindow cleanup (#7204)

* Replace `RollingSessionWindow` with `RuntimeInfo` - initial commit

* Fix tests in import

* Fix the rest of the tests

* Remove dead code

* Fix todos

* Simplify session caching

* Comments for `SessionInfoProvider`

* Separate `SessionInfoProvider` from `State`

* `cache_session_info_for_head` becomes freestanding function

* Remove unneeded `mut` usage

* fn session_info -> fn get_session_info() to avoid name clashes. The function also tries to initialize `SessionInfoProvider`

* Fix SessionInfo retrieval

* Code cleanup

* Don't wrap `SessionInfoProvider` in an `Option`

* Remove `earliest_session()`

* Remove pre-caching -> wip

* Fix some tests and code cleanup

* Fix all tests

* Fixes in tests

* Fix comments, variable names and small style changes

* Fix a warning

* impl From<SessionWindowSize> for NonZeroUsize

* Fix logging for `get_session_info` - remove redundant logs and decrease log level to DEBUG

* Code review feedback

* Storage migration removing `COL_SESSION_WINDOW_DATA` from parachains db

* Remove `col_session_data` usages

* Storage migration clearing columns w/o removing them

* Remove session data column usages from `approval-voting` and `dispute-coordinator` tests

* Add some test cases from `RollingSessionWindow` to `dispute-coordinator` tests

* Fix formatting in initialized.rs

* Fix a corner case in `SessionInfo` caching for `dispute-coordinator`

* Remove `RollingSessionWindow` ;(

* Revert "Fix formatting in initialized.rs"

This reverts commit 0f94664ec9f3a7e3737a30291195990e1e7065fc.

* v2 to v3 migration drops `COL_DISPUTE_COORDINATOR_DATA` instead of clearing it

* Fix `NUM_COLUMNS` in `approval-voting`

* Use `columns::v3::NUM_COLUMNS` when opening db

* Update node/service/src/parachains_db/upgrade.rs

Co-authored-by: Andrei Sandu <54316454+sandreim@users.noreply.github.com>

* Don't write in `COL_DISPUTE_COORDINATOR_DATA` for `test_rocksdb_migrate_2_to_3`

* Fix `NUM+COLUMNS` in approval_voting

* Fix formatting

* Fix columns usage

* Clarification comments about the different db versions

---------

Co-authored-by: Andrei Sandu <54316454+sandreim@users.noreply.github.com>

polkadot/node/core/approval-voting/src/lib.rs

@@ -116,8 +116,6 @@ const LOG_TARGET: &str = "parachain::approval-voting";
 pub struct Config {
 	/// The column family in the DB where approval-voting data is stored.
 	pub col_approval_data: u32,
-	/// The of the DB where rolling session info is stored.
-	pub col_session_data: u32,
 	/// The slot duration of the consensus algorithm, in milliseconds. Should be evenly
 	/// divisible by 500.
 	pub slot_duration_millis: u64,
@@ -357,10 +355,7 @@ impl ApprovalVotingSubsystem {
 			keystore,
 			slot_duration_millis: config.slot_duration_millis,
 			db,
-			db_config: DatabaseConfig {
-				col_approval_data: config.col_approval_data,
-				col_session_data: config.col_session_data,
-			},
+			db_config: DatabaseConfig { col_approval_data: config.col_approval_data },
 			mode: Mode::Syncing(sync_oracle),
 			metrics,
 		}
@@ -369,10 +364,8 @@ impl ApprovalVotingSubsystem {
 	/// Revert to the block corresponding to the specified `hash`.
 	/// The operation is not allowed for blocks older than the last finalized one.
 	pub fn revert_to(&self, hash: Hash) -> Result<(), SubsystemError> {
-		let config = approval_db::v1::Config {
-			col_approval_data: self.db_config.col_approval_data,
-			col_session_data: self.db_config.col_session_data,
-		};
+		let config =
+			approval_db::v1::Config { col_approval_data: self.db_config.col_approval_data };
 		let mut backend = approval_db::v1::DbBackend::new(self.db.clone(), config);
 		let mut overlay = OverlayedBackend::new(&backend);