fix: update JUnit parser to correct duration handling

[gibiw]

• Adjusted the duration values in the JUnit test cases from 0.05 seconds to 50.0 seconds to reflect accurate execution times.
• Enhanced the test assertions to validate the duration of execution results, ensuring consistency with the updated values.

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Note

Converts JUnit test case durations from seconds to milliseconds and updates tests to expect and assert the new values; also fixes range variable capture for test cases.

• Parser (internal/parsers/junit/junit.go):
  • Set Execution.Duration to milliseconds: duration := testCase.Time * 1000 and use &duration.
  • Fix range variable capture by shadowing testCase inside the loop.
• Tests (internal/parsers/junit/junit_test.go):
  • Update expected durations from 0.05 to 50.0.
  • Add assertions to verify Execution.Duration is set and equals expected.

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