Preserve explicit @RequestParam names when compiler metadata is unknown

[SwatiKumari250]

Summary

• Avoid removing explicit @RequestParam names when the recipe cannot establish that Java parameter-name metadata is available.
• Add regression coverage for a parameter whose explicit annotation name matches its Java variable name.

Motivation

Addresses the failure mode described in #736, where removing an explicit @RequestParam value can break applications compiled without -parameters.

Verification

This PR is opened as a draft because the Gradle test suite has not been run in this environment. Please review the conservative behavior change and run the focused test before treating this as ready for review.

• Fixes ImplicitWebAnnotationNames removes @RequestParam argument even when -parameters is missing #736