Multi-select inputs in pipeline UI

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Problem

GitLab CI/CD pipeline inputs with dropdown options currently only allow selecting a single value. Users need the ability to select multiple values from the dropdown options.

Desired Feature

Users want to select multiple options which would be combined into a single variable value using a delimiter.

Use Cases:

• Restarting services on multiple instances
• Building multiple Docker images in one pipeline
• Running tests with multiple tag combinations
• Any scenario requiring operations across multiple targets