chore: relax Detekt rules for tests (#582)

- Updated `detekt.yml` to exclude test folders from
`EmptyFunctionBlock`, `LargeClass`, and `LongMethod` checks.
- Cleanup detekt-baseline files.
- Simplified `.idea/detekt.xml`.

## Motivation and Context
To reduce linter noise and reduce tension

## How Has This Been Tested?
`./gradlew detekt`

## Breaking Changes
No

## Types of changes
- [x] Build tool/ci update

## Checklist
<!-- Go over all the following points, and put an `x` in all the boxes
that apply. -->
- [x] I have read the [MCP
Documentation](https://modelcontextprotocol.io)
- [x] My code follows the repository's style guidelines
- [x] New and existing tests pass locally
- [ ] I have added appropriate error handling
- [ ] I have added or updated documentation as needed

## Additional context

#567

.idea/detekt.xml

@@ -1,14 +1,9 @@
 <?xml version="1.0" encoding="UTF-8"?>
 <project version="4">
   <component name="DetektPluginSettings">
-    <option name="configurationFiles">
-      <list>
-        <option value="$PROJECT_DIR$/detekt.yml" />
-      </list>
-    </option>
     <option name="enableDetekt" value="true" />
     <option name="enableForProjectResult" value="Accepted" />
     <option name="redirectChannels" value="true" />
     <option name="treatAsErrors" value="true" />
   </component>
-</project>
+</project>