Add notebook logging example

[gabrielfeo]

Follow up to changes of #476. Related to #332.

[Copilot]

Pull Request Overview

This PR adds a notebook example demonstrating logging functionality and updates test infrastructure to better capture output streams from executed processes.

Key changes:

• Added a new Logging.ipynb notebook example showing how to enable debug logging in Kotlin Jupyter environments
• Enhanced test infrastructure to capture both stdout and stderr streams separately from shell commands and notebook executions
• Updated existing tests to use the new output stream structure

Reviewed Changes

Copilot reviewed 8 out of 8 changed files in this pull request and generated 1 comment.

Show a summary per file

File	Description
Shell.kt	Modified to return separate stdout/stderr streams instead of just stdout
Jupyter.kt	Enhanced to capture output streams from notebook execution
NotebooksTest.kt	Added test for logging notebook and updated to use new output structure
ScriptsTest.kt	Updated to access stdout from new output stream structure
ExampleProjectTest.kt	Updated to access stdout from new output stream structure
ExampleGradleTaskTest.kt	Updated to access stdout from new output stream structure
Logging.ipynb	New notebook example demonstrating logging functionality
Logging.md	Updated documentation with reference to new logging example

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[github-actions]

Job Summary for Gradle

Check PR :: kotlin-tests

Gradle Root Project	Requested Tasks	Gradle Version	Build Outcome	Build Scan®
develocity-api-kotlin	check	9.0.0	❌
dak-example-gradle-project	dependencies --configuration runtimeClasspath	9.0.0	✅
dak-example-gradle-task-main-…	:buildSrc:dependencies --configuration runtimeClasspath	9.0.0	✅
dak-example-gradle-project	run	9.0.0	✅
dak-example-gradle-task-main-…	userBuildPerformanceMetrics	9.0.0	✅
dak-example-gradle-task-main-…	userBuildPerformanceMetrics --user runner --period=-1d	9.0.0	✅