RUN-3729: Allow DataKeyFilterMultiLines to handle ssm output

[Jesus-Osuna-M]

No description provided.

[Copilot]

Pull Request Overview

This PR enhances the DataKeyFilterMultiLines plugin to handle multi-line input that arrives in a single event, particularly for AWS SSM executor compatibility. The main change splits newline-containing input into separate lines for processing when capturing multiple key-values.

• Adds logic to split newline-containing strings and process each line individually when captureMultipleKeysValues is enabled
• Refactors extraction logic into a new extractSingleLine method
• Adds test cases for AWS SSM behavior (multiple lines in single event) and mixed scenarios

Reviewed Changes

Copilot reviewed 2 out of 3 changed files in this pull request and generated 2 comments.

File	Description
src/main/groovy/com/rundeck/plugin/DataKeyFilterMultiLines.groovy	Refactored extractKeyValue to split multi-line input and added new extractSingleLine method for single-line processing
src/test/groovy/com/rundeck/plugin/DataKeyFilterMultiLinesSpec.groovy	Added test cases for AWS SSM behavior with multi-line events and mixed input scenarios
build.gradle	Configured test task to use JUnit Platform for Spock framework compatibility

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