fix: ignore error when key not found in keys delete (backport #1312)

[mergify]

Description

If you provide a list of keys to the keys delete command, it will stop and fail if one of those keys is not found.

This pr cherry-pick the following pr:

• fix(client/keys): don't return when key not found in keys delete  cosmos/cosmos-sdk#18562

Motivation and context

How has this been tested?

Screenshots (if appropriate):

Checklist:

• I followed the contributing guidelines and code of conduct.
• I have added a relevant changelog to CHANGELOG.md
• I have added tests to cover my changes.
• I have updated the documentation accordingly.
• I have updated API documentation client/docs/swagger-ui/swagger.yaml

---

This is an automatic backport of pull request #1312 done by [Mergify](https://mergify.com).

[mergify]

Cherry-pick of e5709f3 has failed:

On branch mergify/bp/release/v0.48.x/pr-1312
Your branch is up to date with 'origin/release/v0.48.x'.

You are currently cherry-picking commit e5709f332.
  (fix conflicts and run "git cherry-pick --continue")
  (use "git cherry-pick --skip" to skip this patch)
  (use "git cherry-pick --abort" to cancel the cherry-pick operation)

Changes to be committed:
	modified:   client/keys/delete.go
	modified:   client/keys/delete_test.go

Unmerged paths:
  (use "git add <file>..." to mark resolution)
	both modified:   CHANGELOG.md

To fix up this pull request, you can check it out locally. See documentation: https://docs.github.com/en/pull-requests/collaborating-with-pull-requests/reviewing-changes-in-pull-requests/checking-out-pull-requests-locally

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 69.78%. Comparing base (506f8ff) to head (506f8ff).

❗ Current head 506f8ff differs from pull request most recent head 8ffc905. Consider uploading reports for the commit 8ffc905 to get more accurate results

Additional details and impacted files

@@               Coverage Diff                @@
##           release/v0.48.x    #1315   +/-   ##
================================================
  Coverage            69.78%   69.78%           
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  Files                  646      646           
  Lines                67541    67541           
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  Hits                 47134    47134           
  Misses               18218    18218           
  Partials              2189     2189