feat: enhance block explorer utility tests with edge cases and multiple explorers

[tiendn]

Description

• Added comprehensive tests for block explorer utilities, covering edge cases such as chains without block explorers and chains without API URLs.
• Implemented tests for handling multiple block explorers, ensuring correct explorer selection by index.
• Included tests for special chain names and proper URL handling, particularly with trailing slashes.

Drive-by changes

Related issues

Backward compatibility

Testing

All new tests have been implemented and verified for correctness.

[changeset-bot]

🦋 Changeset detected

Latest commit: ede099b

The changes in this PR will be included in the next version bump.

This PR includes changesets to release 9 packages

Name	Type
@hyperlane-xyz/infra	Minor
@hyperlane-xyz/sdk	Minor
@hyperlane-xyz/cli	Minor
@hyperlane-xyz/helloworld	Minor
@hyperlane-xyz/widgets	Minor
@hyperlane-xyz/ccip-server	Minor
@hyperlane-xyz/github-proxy	Minor
@hyperlane-xyz/utils	Minor
@hyperlane-xyz/core	Patch

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[jmrossy]

@tiendn Thanks for the PR. CI seems to be failing but I don't know why. Try pulling latest from upstream main into your branch.

[tiendn]

@tiendn Thanks for the PR. CI seems to be failing but I don't know why. Try pulling latest from upstream main into your branch.

Oh sorry, I pulled it, please check again.

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 77.53%. Comparing base (5765587) to head (225c11a).
Report is 1 commits behind head on main.

Additional details and impacted files

@@           Coverage Diff           @@
##             main    #5147   +/-   ##
=======================================
  Coverage   77.53%   77.53%           
=======================================
  Files         103      103           
  Lines        2110     2110           
  Branches      190      190           
=======================================
  Hits         1636     1636           
  Misses        453      453           
  Partials       21       21           

Components	Coverage Δ
core	87.80% <ø> (ø)
hooks	79.39% <ø> (ø)
isms	83.68% <ø> (ø)
token	91.27% <ø> (ø)
middlewares	79.80% <ø> (ø)