Add method-level test filtering support to JUnitRunner

[jakobcodes]

Description

This PR enhances the JUnitRunner by adding support for method-level test filtering. The implementation allows for more granular control over test execution by enabling filtering of individual test methods, rather than just entire test suites.

Changes

• Added method-level filtering capability to JUnitRunner
• Introduced excludedTests tracking mechanism for filtered test methods
• Implemented filter logic using ScalaTest's tagging system

Implementation Details

• Uses a mutable Set to track excluded test methods
• Leverages ScalaTest's DynaTags for runtime test filtering
• Properly handles empty test scenarios with NoTestsRemainException

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