chore: add debug log for reduntant relay

[PanGan21]

Description

Add debug log for reduntant relay in RecvPacket

closes: #3599

Commit Message / Changelog Entry

chore: add debug log for reduntant relay

---

Before we can merge this PR, please make sure that all the following items have been
checked off. If any of the checklist items are not applicable, please leave them but
write a little note why.

• Targeted PR against correct branch (see CONTRIBUTING.md).
• Linked to Github issue with discussion and accepted design OR link to spec that describes this work.
• Code follows the module structure standards and Go style guide.
• Wrote unit and integration tests.
• Updated relevant documentation (docs/) or specification (x/<module>/spec/).
• Added relevant godoc comments.
• Provide a commit message to be used for the changelog entry in the PR description for review.
• Re-reviewed Files changed in the Github PR explorer.
• Review Codecov Report in the comment section below once CI passes.

[codecov-commenter]

Codecov Report

Merging #3616 (f473963) into main (b21014e) will increase coverage by 0.00%.
The diff coverage is 100.00%.

Additional details and impacted files

@@           Coverage Diff           @@
##             main    #3616   +/-   ##
=======================================
  Coverage   78.79%   78.80%           
=======================================
  Files         182      182           
  Lines       12688    12689    +1     
=======================================
+ Hits         9998     9999    +1     
  Misses       2258     2258           
  Partials      432      432           

Impacted Files	Coverage Δ
modules/core/keeper/msg_server.go	54.87% <100.00%> (+0.09%)	⬆️

[colin-axner]

thanks @PanGan21 :)

[DimitrisJim]

lgtm!

[colin-axner]

Thanks!