refactor!: remove unnecessary getters on connection end

[colin-axner]

Description

closes: #XXXX

Commit Message / Changelog Entry

type: commit message

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Before we can merge this PR, please make sure that all the following items have been
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• Targeted PR against the 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.
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• Review Codecov Report in the comment section below once CI passes.

[codecov-commenter]

Codecov Report

All modified and coverable lines are covered by tests ✅

Comparison is base (d330de7) 81.55% compared to head (4d70f38) 81.59%.
Report is 2 commits behind head on main.

Additional details and impacted files

@@            Coverage Diff             @@
##             main    #5777      +/-   ##
==========================================
+ Coverage   81.55%   81.59%   +0.03%     
==========================================
  Files         199      199              
  Lines       15180    15167      -13     
==========================================
- Hits        12380    12375       -5     
+ Misses       2334     2326       -8     
  Partials      466      466              

Files	Coverage Δ
...interchain-accounts/controller/keeper/handshake.go	83.70% <100.00%> (ø)
...ules/apps/27-interchain-accounts/types/metadata.go	79.79% <100.00%> (ø)
modules/core/03-connection/keeper/keeper.go	92.36% <100.00%> (ø)
modules/core/03-connection/keeper/verify.go	80.36% <100.00%> (ø)
modules/core/03-connection/types/codec.go	100.00% <ø> (ø)
modules/core/03-connection/types/connection.go	89.83% <ø> (+10.72%)	⬆️
modules/core/04-channel/keeper/handshake.go	90.20% <100.00%> (ø)
modules/core/04-channel/keeper/packet.go	99.09% <100.00%> (ø)
modules/core/04-channel/keeper/timeout.go	95.39% <100.00%> (ø)
modules/core/04-channel/keeper/upgrade.go	92.46% <100.00%> (ø)

[DimitrisJim]

🧹 🧹 🧹

[damiannolan]

Sweet!