Ignore initializers with attributes in unneeded_synthesized_initializer rule

[SimplyDanny]

Fixes #5153.

[SwiftLintBot]

	17 Messages
📖	Linting Aerial with this PR took 0.91s vs 0.93s on main (2% faster)
📖	Linting Alamofire with this PR took 1.26s vs 1.27s on main (0% faster)
📖	Linting Brave with this PR took 7.39s vs 7.42s on main (0% faster)
📖	Linting DuckDuckGo with this PR took 4.67s vs 4.71s on main (0% faster)
📖	Linting Firefox with this PR took 10.83s vs 10.85s on main (0% faster)
📖	Linting Kickstarter with this PR took 9.81s vs 9.8s on main (0% slower)
📖	Linting Moya with this PR took 0.52s vs 0.53s on main (1% faster)
📖	Linting NetNewsWire with this PR took 2.55s vs 2.54s on main (0% slower)
📖	Linting Nimble with this PR took 0.76s vs 0.76s on main (0% slower)
📖	Linting PocketCasts with this PR took 8.49s vs 8.48s on main (0% slower)
📖	Linting Quick with this PR took 0.47s vs 0.44s on main (6% slower)
📖	Linting Realm with this PR took 4.62s vs 4.61s on main (0% slower)
📖	Linting Sourcery with this PR took 2.36s vs 2.34s on main (0% slower)
📖	Linting Swift with this PR took 4.55s vs 4.53s on main (0% slower)
📖	Linting VLC with this PR took 1.24s vs 1.24s on main (0% slower)
📖	Linting Wire with this PR took 17.95s vs 17.93s on main (0% slower)
📖	Linting WordPress with this PR took 11.72s vs 11.7s on main (0% slower)

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