Ignore unowned(unsafe) captures by default

[Yurii201811]

Summary

Ignore unowned(unsafe) captures by default while preserving an opt-in include_unsafe setting.

Background

The explicit unsafe spelling communicates the intended lifetime tradeoff.

Closes #6817

Changes

• add include_unsafe, defaulting to false
• distinguish unsafe capture specifiers from unowned and unowned(safe)
• cover default and configured behavior
• update generated configuration metadata and changelog

Verification

• generated rule tests
• full Swift tests
• SwiftLint self-lint
• remaining platform gates or CI

[SwiftLintBot]

	19 Messages
📖	Building this branch resulted in a binary size of 28378.98 KiB vs 28357.8 KiB when built on main (0% larger).
📖	Linting Aerial with this PR took 0.67 s vs 0.69 s on main (2% faster).
📖	Linting Alamofire with this PR took 0.93 s vs 0.91 s on main (2% slower).
📖	Linting Brave with this PR took 5.97 s vs 5.97 s on main (0% slower).
📖	Linting DuckDuckGo with this PR took 25.82 s vs 25.9 s on main (0% faster).
📖	Linting Firefox with this PR took 10.36 s vs 10.44 s on main (0% faster).
📖	Linting Kickstarter with this PR took 7.31 s vs 7.35 s on main (0% faster).
📖	Linting Moya with this PR took 0.37 s vs 0.38 s on main (2% faster).
📖	Linting NetNewsWire with this PR took 2.34 s vs 2.36 s on main (0% faster).
📖	Linting Nimble with this PR took 0.53 s vs 0.57 s on main (7% faster).
📖	Linting PocketCasts with this PR took 6.9 s vs 6.9 s on main (0% slower).
📖	Linting Quick with this PR took 0.33 s vs 0.36 s on main (8% faster).
📖	Linting Realm with this PR took 2.41 s vs 2.42 s on main (0% faster).
📖	Linting Sourcery with this PR took 1.47 s vs 1.5 s on main (2% faster).
📖	Linting Swift with this PR took 4.21 s vs 4.24 s on main (0% faster).
📖	Linting SwiftLintPerformanceTests with this PR took 0.16 s vs 0.16 s on main (0% slower).
📖	Linting VLC with this PR took 1.11 s vs 1.08 s on main (2% slower).
📖	Linting Wire with this PR took 15.19 s vs 15.15 s on main (0% slower).
📖	Linting WordPress with this PR took 9.65 s vs 9.67 s on main (0% faster).

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