Fix prefer_self_in_static_references for shadowed nested types

[theamodhshetty]

Summary

• skip prefer_self_in_static_references violations when a nested type shadows its enclosing type name
• add a rule example covering the shadowed nested type case
• add the changelog entry

Testing

• swift test --filter PreferSelfInStaticReferencesRuleGeneratedTests
• ./.build/debug/swiftlint lint Source/SwiftLintBuiltInRules/Rules/Style/PreferSelfInStaticReferencesRule.swift Source/SwiftLintBuiltInRules/Rules/Style/PreferSelfInStaticReferencesRuleExamples.swift CHANGELOG.md --strict
• manual repro with only_rules: [prefer_self_in_static_references] against the struct S1 { struct S1 {}; var s = S1() } sample

[SwiftLintBot]

	1 Warning
⚠️	This PR may need tests.

	20 Messages
📖	Building this branch resulted in a binary size of 27359.09 KiB vs 27357.74 KiB when built on main (0% larger).
📖	Linting Aerial with this PR took 0.83 s vs 0.82 s on main (1% slower).
📖	Linting Alamofire with this PR took 1.07 s vs 1.04 s on main (2% slower).
📖	Linting Brave with this PR took 7.09 s vs 7.09 s on main (0% slower).
📖	Linting DuckDuckGo with this PR took 26.99 s vs 26.97 s on main (0% slower).
📖	Linting Firefox with this PR took 11.88 s vs 11.92 s on main (0% faster).
📖	Linting Kickstarter with this PR took 8.24 s vs 8.23 s on main (0% slower).
📖	Linting Moya with this PR took 0.48 s vs 0.45 s on main (6% slower).
📖	Linting NetNewsWire with this PR took 2.58 s vs 2.6 s on main (0% faster).
📖	Linting Nimble with this PR took 0.7 s vs 0.69 s on main (1% slower).
📖	Linting PocketCasts with this PR took 7.76 s vs 7.79 s on main (0% faster).
📖	Linting Quick with this PR took 0.47 s vs 0.46 s on main (2% slower).
📖	Linting Realm with this PR took 2.98 s vs 2.95 s on main (1% slower).
📖	Linting Sourcery with this PR took 1.85 s vs 1.84 s on main (0% slower).
📖	Linting Swift with this PR took 4.65 s vs 4.67 s on main (0% faster).
📖	Linting SwiftLintPerformanceTests with this PR took 0.35 s vs 0.35 s on main (0% slower).
📖	Linting VLC with this PR took 1.21 s vs 1.19 s on main (1% slower).
📖	Linting Wire with this PR took 18.63 s vs 18.67 s on main (0% faster).
📖	Linting WordPress with this PR took 12.63 s vs 12.64 s on main (0% faster).
📖	This PR fixed a violation in WordPress: /Modules/Sources/AsyncImageKit/ImageDownloader.swift:260:32: Warning: Use Self to refer to the surrounding type name (prefer_self_in_static_references)

Generated by 🚫 Danger