Add CI mode support to beta installation template

[marc0der]

Summary

• Implements the ci=true query parameter for beta installation scripts to optimize SDKMAN settings for CI environments
• Configures non-interactive settings when running in CI mode: sdkman_auto_answer=true, sdkman_colour_enable=false, and sdkman_selfupdate_feature=false
• Adds tests to verify the CI mode functionality with both positive and negative assertions

Test plan

• Cucumber tests verify the installation script correctly configures CI-friendly settings when the ci=true parameter is present
• All tests pass for existing and new functionality

This addresses part of issue sdkman/sdkman-cli#1270 in the sdkman-cli repository.

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