`opening_brace` now triggers on multiline if statements

[michaeleustace]

New Issue Checklist

• [x] Updated SwiftLint to the latest version
• [x] I searched for existing GitHub issues

Describe the bug

To be consistent with other multiline bracket rules, when we have a multiline if statement we put the opening brace on a new line. Before the rewrite using SwiftSyntax, this usage was never triggered. Now, however it is.

Could this usage either be prevented from triggering the rule, or at least have a configuration option to ignore such cases.

Environment

• SwiftLint version (run swiftlint version to be sure)? 0.55.1
• Installation method used (Homebrew, CocoaPods, building from source, etc)? Cocoapods
• Paste your configuration file:

# insert yaml contents here

• Are you using nested configurations? No If so, paste their relative paths and respective contents.
• Which Xcode version are you using (check xcodebuild -version)? 15.3
• Do you have a sample that shows the issue? Run echo "[string here]" | swiftlint lint --no-cache --use-stdin --enable-all-rules to quickly test if your example is really demonstrating the issue. If your example is more complex, you can use swiftlint lint --path [file here] --no-cache --enable-all-rules.

// This does not trigger violation
guard
    condition1,
    let var1 = var1
else {
...

// This triggers a violation:
if
    condition1,
    let var1 = var1
{

[SimplyDanny]

There is #5521 to make this optional.