Revert "[Runtime] Bound XCMP queue" (#3117)

Reverts paritytech/polkadot-sdk#2302. 🤦‍♂️ should have checked the
migration CI first.

We either need to reduce the `max_message_size` for the open HRMP
channels on the failing chains or increase the `PageSize` of the XCMP
queue.
Both would be fine on a test-net, but i assume this will also fail
before the next SP runtime upgrade so first need to think what best to
do.
AFAIK its not possible currently to change the `max_message_size` of an
open HRMP channel.

prdoc/pr_2302.prdoc

@@ -1,20 +0,0 @@
-title: Storage bound the XCMP queue pallet
-
-doc:
-  - audience: Runtime Dev
-    description: |
-      Enforce upper limits for the number of suspended channels and on
-      the number of channels that have messages pending. This is needed to use
-      the worst-case PoV benchmarking.
-
-migrations:
-  db: []
-
-  runtime:
-    - reference: cumulus_pallet_xcmp_queue::migration::v5::MigrateV4ToV5
-      description: A No-OP migration is deployed to ensure that all `BoundedVec`s` still decode as expected.
-
-crates:
-  - name: cumulus-pallet-xcmp-queue
-
-host_functions: []