This PR addresses GuardLogStatement issues identified via static analysis (CodeFlow).

Logger.error calls are now protected with log-level checks to prevent unnecessary
message construction when error logging is disabled.
Converted MavenWrapperDownloader into a proper utility class
by adding a private constructor to prevent instantiation.

No functional or business logic changes were introduced.

Static Analysis Impact (CodeFlow)

• GuardLogStatement issues: ✅ Fixed
• CloseResource issues: ✅ Fixed (try-with-resources)
• UseUtilityClass issue: ✅ Fixed (utility class pattern)

📉 CodeFlow results:

• Errors reduced

Known / Accepted Issues

• SpringBootLoginExampleApplication is flagged by static analysis
  as UseUtilityClass, however this is an expected and acceptable
  pattern for Spring Boot entry-point classes.
• No change was made intentionally to avoid altering framework conventions.

This demonstrates a QA-driven improvement focusing on code quality, resource safety, and logging best practices.