fix(sdk): `OrderTracker` is getting out of sync

[Hywan]

In EventLinkedChunk::reset, the OrderTracker isn't reset properly:

matrix-rust-sdk/crates/matrix-sdk/src/event_cache/room/events.rs

Lines 78 to 84 in aa79e34

	/// Clear all events.
	///
	/// All events, all gaps, everything is dropped, move into the void, into
	/// the ether, forever.
	pub fn reset(&mut self) {
	self.chunks.clear();
	}

which then later can create an error in linked_chunk::AsVector:

matrix-rust-sdk/crates/matrix-sdk-common/src/linked_chunk/as_vector.rs

Lines 492 to 499 in aa79e34

	// Chunk has not been found.
	ControlFlow::Continue(..) => {
	// SAFETY: Assuming `LinkedChunk` and `ObservableUpdates` are not buggy, and
	// assuming `Self::chunks` is correctly initialized, it is not possible to work
	// on a chunk that does not exist. If this predicate fails, it means
	// `LinkedChunk` or `ObservableUpdates` contain a bug.
	panic!("The chunk is not found");
	}

[Hywan]

So, after further digging, OrderTracker will receive its updates from self.chunks.clear(), which means it doesn't need to be reset. We have a bug though, see https://sentry.tools.element.io/organizations/element/issues/11218915/?project=63&query=is%3Aunresolved&statsPeriod=14d&stream_index=15