Update GitHub readme files for Java and Python agents with correct links and info.
Update GitHub readme files for Java and Python agents with correct links and info.

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Created by MOE: https://github.com/google/moe
MOE_MIGRATED_REVID=172013236

GoogleCloudPlatform/cloud-debug-java,GoogleCloudPlatform/cloud-debug-java,GoogleCloudPlatform/cloud-debug-java,GoogleCloudPlatform/cloud-debug-java