fix: return 404 on non-existing tx (backport cosmos#10992) (cosmos#11015

)

* fix: return 404 on non-existing tx (cosmos#10992)

(cherry picked from commit 1581289)

* fix cl

Co-authored-by: Aleksandr Bezobchuk <alexanderbez@users.noreply.github.com>
Co-authored-by: Aleksandr Bezobchuk <aleks.bezobchuk@gmail.com>

CHANGELOG.md

@@ -149,7 +149,8 @@ Ref: https://keepachangelog.com/en/1.0.0/
 
 ### Bug Fixes
 
-* (std/codec) [/#10595](https://github.com/cosmos/cosmos-sdk/pull/10595) Add evidence to std/codec to be able to decode evidence in client interactions.
+* (grpc) [\#10985](https://github.com/cosmos/cosmos-sdk/pull/10992) The `/cosmos/tx/v1beta1/txs/{hash}` endpoint returns a 404 when a tx does not exist.
+* (std/codec) [/#10595](https://github.com/cosmos/cosmos-sdk/pull/10595) Add evidence to std/codec to be able to decode evidence in client interactions. 
 * (types) [\#9627](https://github.com/cosmos/cosmos-sdk/pull/9627) Fix nil pointer panic on `NewBigIntFromInt`.
 * [#10725](https://github.com/cosmos/cosmos-sdk/pull/10725) populate `ctx.ConsensusParams` for begin/end blockers.
 * [\#9829](https://github.com/cosmos/cosmos-sdk/pull/9829) Fixed Coin denom sorting not being checked during `Balance.Validate` check. Refactored the Validation logic to use `Coins.Validate` for `Balance.Coins`