Update Logback smoke test to use new assertion framework

[Copilot]

Updates the Logback smoke test to use the new assertion framework introduced in #4141, making the tests more readable and maintainable.

Changes Made

Extended Assertion Framework

• Added MessageAssert: New assertion class for MessageData with fluent API methods like hasMessage(), hasSeverityLevel(), hasProperty(), etc.
• Added ExceptionAssert: New assertion class for ExceptionData with methods like hasExceptionType(), hasExceptionMessage(), hasSeverityLevel(), etc.
• Extended TraceAssert: Added hasMessageSatisying(), hasExceptionSatisying(), and hasExceptionCount() methods to support message and exception assertions

Updated Test Files

• LogbackTest.java: Converted from manual assertion style to new framework using waitAndAssertTrace()
• LogbackLevelOffTest.java: Updated to use new assertion framework for cleaner implementation
• LogbackDisabledTest.java: Updated to use new assertion framework for consistency

Benefits

Before (old style):

List<Envelope> rdList = testing.mockedIngestion.waitForItems("RequestData", 1);
Envelope rdEnvelope = rdList.get(0);
RequestData rd = (RequestData) ((Data<?>) rdEnvelope.getData()).getBaseData();
assertThat(rd.getName()).isEqualTo("GET /Logback/test");

List<MessageData> logs = testing.mockedIngestion.getMessageDataInRequest(3);
logs.sort(Comparator.comparing(MessageData::getSeverityLevel));
MessageData md1 = logs.get(0);
assertThat(md1.getMessage()).isEqualTo("This is logback warn.");
assertThat(md1.getSeverityLevel()).isEqualTo(SeverityLevel.WARNING);

After (new framework):

testing.waitAndAssertTrace(
    trace ->
        trace
            .hasRequestSatisying(
                request ->
                    request
                        .hasName("GET /Logback/test")
                        .hasSuccess(true)
                        .hasNoParent())
            .hasMessageSatisying(
                message ->
                    message
                        .hasMessage("This is logback warn.")
                        .hasSeverityLevel(SeverityLevel.WARNING)));

Improvements:

• More readable: Fluent API makes test intent clearer
• Better error messages: Framework provides detailed assertion failure messages
• Consistent pattern: Aligns with existing RequestAssert, DependencyAssert, and MetricAssert from Nicer smoke test assertions #4141
• Reduced boilerplate: Less manual data extraction and casting
• Maintainable: Centralized assertion logic in reusable classes

Testing

• All files compile successfully
• Code passes spotlessApply formatting
• Tests maintain the same validation logic with improved readability
• New assertion classes follow the same patterns as existing framework components

The changes maintain full backward compatibility while providing a cleaner, more maintainable testing experience aligned with the assertion framework introduced in #4141.

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