fix: fixed missing coin denomination in msg server logs (backport cos…

…mos#9786) (cosmos#9844)

* fix: fixed missing coin denomination in msg server logs (cosmos#9786)

<!--
The default pull request template is for types feat, fix, or refactor.
For other templates, add one of the following parameters to the url:
- template=docs.md
- template=other.md
-->

## Description

Closes: [cosmos#9785](cosmos#9785)

This PR modifies _x/staking/keeper/msg_server.go_ file and fixes coin denomination issues in the emitted events.

---

### Author Checklist

*All items are required. Please add a note to the item if the item is not applicable and
please add links to any relevant follow up issues.*

I have...

- [x] included the correct [type prefix](https://github.com/commitizen/conventional-commit-types/blob/v3.0.0/index.json) in the PR title
- [ ] added `!` to the type prefix if API or client breaking change
- [x] targeted the correct branch (see [PR Targeting](https://github.com/cosmos/cosmos-sdk/blob/master/CONTRIBUTING.md#pr-targeting))
- [x] provided a link to the relevant issue or specification
- [x] followed the guidelines for [building modules](https://github.com/cosmos/cosmos-sdk/blob/master/docs/building-modules)
- [ ] included the necessary unit and integration [tests](https://github.com/cosmos/cosmos-sdk/blob/master/CONTRIBUTING.md#testing)
- [ ] added a changelog entry to `CHANGELOG.md`
- [ ] included comments for [documenting Go code](https://blog.golang.org/godoc)
- [ ] updated the relevant documentation or specification
- [x] reviewed "Files changed" and left comments if necessary
- [ ] confirmed all CI checks have passed

### Reviewers Checklist

*All items are required. Please add a note if the item is not applicable and please add
your handle next to the items reviewed if you only reviewed selected items.*

I have...

- [x] confirmed the correct [type prefix](https://github.com/commitizen/conventional-commit-types/blob/v3.0.0/index.json) in the PR title
- [x] confirmed `!` in the type prefix if API or client breaking change
- [ ] confirmed all author checklist items have been addressed
- [x] reviewed state machine logic
- [x] reviewed API design and naming
- [x] reviewed documentation is accurate
- [x] reviewed tests and test coverage
- [ ] manually tested (if applicable)

(cherry picked from commit 18eea3a)

# Conflicts:
#	CHANGELOG.md

* Fix conflicts

* move to new section

Co-authored-by: Slav Keremidchiev <[email protected]>
Co-authored-by: Amaury M <[email protected]>

CHANGELOG.md

@@ -54,6 +54,10 @@ Ref: https://keepachangelog.com/en/1.0.0/
 
 * [\#9793](https://github.com/cosmos/cosmos-sdk/pull/9793) Fixed ECDSA/secp256r1 transaction malleability.
 
+### Client-Breaking Changes
+
+* [\#9785](https://github.com/cosmos/cosmos-sdk/issues/9785) Missing coin denomination in logs 
+
 ### CLI Breaking Changes
 
 * [\#9827](https://github.com/cosmos/cosmos-sdk/pull/9827) Ensure input parity of validator public key input between `tx staking create-validator` and `gentx`.