test: expand GovernorStorage coverage

[knoal]

Summary

• add coverage for multiple GovernorStorage proposals being tracked in creation order
• assert out-of-bounds access still reverts after multiple proposals exist
• verify stored proposal details remain accessible after cancellation

Testing

• ./node_modules/.bin/hardhat test test/governance/extensions/GovernorStorage.test.js
• ./node_modules/.bin/prettier --check test/governance/extensions/GovernorStorage.test.js
• ./node_modules/.bin/eslint test/governance/extensions/GovernorStorage.test.js

Closes #5550

[coderabbitai]

Actionable comments posted: 0

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No actionable comments were generated in the recent review. 🎉

ℹ️ Recent review info

⚙️ Run configuration

Configuration used: Repository UI

Review profile: CHILL

Plan: Pro

Run ID: 5b71a489-d547-4f13-b94c-8ee4384456a8

📥 Commits

Reviewing files that changed from the base of the PR and between 74edc4b and 7320e31.

📒 Files selected for processing (2)

• .changeset/green-apples-joke.md
• test/governance/extensions/GovernorStorage.test.js

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Walkthrough

This PR adds two new test cases to the GovernorStorage test suite to improve test coverage around proposal indexing. The first test case verifies that proposalCount and proposalDetailsAt correctly reflect multiple proposals in their creation order, including reverting on out-of-bounds access. The second test case confirms that proposalDetails and proposalDetailsAt(0) remain accessible after a proposal is cancelled. A Changesets entry documents these test coverage improvements.

🚥 Pre-merge checks | ✅ 5

✅ Passed checks (5 passed)

Check name	Status	Explanation
Title check	✅ Passed	The title accurately summarizes the main change: expanding test coverage for the GovernorStorage component.
Description check	✅ Passed	The description clearly outlines the specific test additions and improvements related to GovernorStorage coverage and includes relevant testing commands.
Linked Issues check	✅ Passed	The PR addresses issue #5550's requirement to add edge-case coverage for multiple proposals and verify behavior after cancellation, though documentation/code clarity improvements are not fully addressed.
Out of Scope Changes check	✅ Passed	All changes are focused on test coverage expansion for GovernorStorage as specified in the linked issue, with no unrelated modifications.
Docstring Coverage	✅ Passed	No functions found in the changed files to evaluate docstring coverage. Skipping docstring coverage check.

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✨ Finishing Touches

🧪 Generate unit tests (beta)

• Create PR with unit tests

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