Add @SideEffectFree to unmodifiable*() methods

[mernst]

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Reviewing files that changed from the base of the PR and between 0626ede and c11ae1a.

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• src/java.base/share/classes/java/util/Collections.java

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📝 Walkthrough

Walkthrough

This pull request adds the @SideEffectFree annotation to nine public factory methods in Collections.java that create unmodifiable views. The annotated methods are: unmodifiableCollection, unmodifiableSequencedCollection, unmodifiableSortedSet, unmodifiableNavigableSet, unmodifiableList, unmodifiableMap, unmodifiableSequencedMap, unmodifiableSortedMap, and unmodifiableNavigableMap. These annotations indicate that these factory methods have no observable side effects.

🚥 Pre-merge checks | ✅ 3

✅ Passed checks (3 passed)

Check name	Status	Explanation
Docstring Coverage	✅ Passed	Docstring coverage is 100.00% which is sufficient. The required threshold is 80.00%.
Linked Issues check	✅ Passed	Check skipped because no linked issues were found for this pull request.
Out of Scope Changes check	✅ Passed	Check skipped because no linked issues were found for this pull request.

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✨ Finishing Touches

🧪 Generate unit tests (beta)

• Create PR with unit tests

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