Fix statement_position for guard else without whitespace

[theamodhshetty]

Summary

• detect guard foo()else in statement_position
• autocorrect it to guard foo() else
• add regression examples and a changelog entry

The rule currently only looks for else and catch after a closing brace, so the guard form from #6153 slips through. This keeps the existing brace-based matching in place and adds a small guard-specific matcher that only fires when else is tokenized as a keyword.

Testing

• swift test --filter StatementPositionRuleGeneratedTests
• swift test --filter StatementPositionRuleTests
• ./.build/debug/swiftlint lint Source/SwiftLintBuiltInRules/Rules/Style/StatementPositionRule.swift CHANGELOG.md --strict

[SwiftLintBot]

	2 Warnings
⚠️	This PR may need tests.
⚠️	This PR introduced a violation in Firefox: /firefox-ios/Client/Frontend/Library/Bookmarks/BookmarksViewController.swift:235:78: Warning: Else and catch should be on the same line, one space after the previous declaration (statement_position)

	19 Messages
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