Skip TemporaryFolder conversion when used in RuleChain.

[motlin]

What's changed?

Added a precondition to TemporaryFolderToTempDir that skips conversion when TemporaryFolder is used within a RuleChain. The recipe now detects calls to RuleChain.outerRule() and RuleChain.around() that receive a TemporaryFolder argument, and skips the entire file in those cases.

What's your motivation?

When TemporaryFolder is converted to @TempDir File, the resulting File type does not implement TestRule, which breaks RuleChain.around() calls that expect a TestRule. By skipping these cases, the existing HandleExternalResourceRules recipe can handle them instead by adding @ExtendWith(ExternalResourceSupport.class).

Anything in particular you'd like reviewers to focus on?

The precondition operates at the file level—if any TemporaryFolder is used in a RuleChain, the entire file is skipped. This is conservative but simple. A more granular approach could convert standalone TemporaryFolder instances while skipping only those in RuleChain, but this adds complexity for an edge case (mixed usage in a single file).

Anyone you would like to review specifically?

Have you considered any alternatives or workarounds?

1. Granular per-field detection - More complex; would require tracking which specific fields are in RuleChain and only skipping those

Any additional context

Checklist

• I've added unit tests to cover both positive and negative cases
• I've read and applied the recipe conventions and best practices
• I've used the IntelliJ IDEA auto-formatter on affected files

[timtebeek]

Perfect addition; thanks a lot for adding this precondition! Best to be safe indeed.