Migrate from TestFactory to ParameterizedTest

[Goooler]

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[Copilot]

Pull request overview

This PR refactors the documentation snippet tests to use a JUnit 5 @ParameterizedTest with a @MethodSource instead of generating DynamicTests, while simplifying the snippet execution model and improving failure diagnostics.

Changes:

• Replace the DynamicTest factory with @ParameterizedTest fed by a snippets() method source.
• Refactor SnippetExecutable from a JUnit Executable sealed class into a sealed interface with an explicit execute(projectRoot: Path) API.
• Simplify code-snippet discovery into a DslLang.extractCodeSnippets() extension and enhance exception messages with source location + build output.

Reviewed changes

Copilot reviewed 5 out of 5 changed files in this pull request and generated no comments.

Show a summary per file

File	Description
src/documentTest/kotlin/com/github/jengelman/gradle/plugins/shadow/snippet/SnippetExecutable.kt	Refactors the snippet executor API and centralizes richer error reporting within execute(Path).
src/documentTest/kotlin/com/github/jengelman/gradle/plugins/shadow/snippet/KotlinBuildExecutable.kt	Updates Kotlin DSL snippet executor to implement the new SnippetExecutable interface shape.
src/documentTest/kotlin/com/github/jengelman/gradle/plugins/shadow/snippet/GroovyBuildExecutable.kt	Updates Groovy DSL snippet executor to implement the new SnippetExecutable interface shape.
src/documentTest/kotlin/com/github/jengelman/gradle/plugins/shadow/snippet/CodeSnippetExtractor.kt	Reworks snippet extraction into a DslLang extension that produces SnippetExecutables with source metadata.
src/documentTest/kotlin/com/github/jengelman/gradle/plugins/shadow/DocCodeSnippetTest.kt	Migrates to @ParameterizedTest + @MethodSource, wiring per-invocation temp directories and named arguments.

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