Do not expire HRMP open channel requests (#3543)

* Do not expire HRMP open channel requests

* Fix the build and update the docs

* Implement canceling requests and do not remove them automatically

* Fix a borked merge

* Fix fmt

* Please spellchecker

* Apply suggestions from code review

Co-authored-by: Amar Singh <asinghchrony@protonmail.com>

* Use `mutate_exists` for maintaining request counts

* Apply `rustfmt`

* Move newly introduced entrypoint to end to preserve ordering

Co-authored-by: Amar Singh <asinghchrony@protonmail.com>

polkadot/scripts/gitlab/lingua.dic

@@ -292,3 +292,6 @@ WND/S
 Wococo
 XCM/S
 XCMP/M
+decrement
+DM
+ParaId