tools: Fix license-builder.sh for ICU
The generated LICENSE using tools/license-builder.sh added by #4194 has omitted the entire Third-Party Software Licenses for ICU. This pull request modifies the license-builder.sh tool to add them back.
Do not update/delete: Banner broadcast message test data
Do not update/delete: Notification broadcast message test data
The generated LICENSE using tools/license-builder.sh added by #4194 has omitted the entire Third-Party Software Licenses for ICU. This pull request modifies the license-builder.sh tool to add them back.