fix: update docker environment and image versions for ecs deployment

[peterxichen]

Summary of Changes

• Point amundsenfrontend environment variables SEARCHSERVICE_BASE and METADATASERVICE_BASE to the correct ports. This resolves the recurring HTTPConnectionPool(host='amundsenmetadata', port=5000) exceptions reported in AWS: Amundsen Frontend not reaching Neo4j #257 amundsenfrontend on ECS not connecting to es & neo4j #210.
• Update image versions to match https://github.com/amundsen-io/amundsen/blob/main/docker-amundsen.yml. The updated versions allow users to load data correctly into elasticsearch using the sample_data_loader referenced in the Quick Start Guide (https://www.amundsen.io/amundsen/installation/).

Tests

N/A - this functionality is not currently tested

Documentation

N/A - consistent with existing documentation (https://github.com/amundsen-io/amundsen/blob/master/docs/installation-aws-ecs/aws-ecs-deployment.md)

CheckList

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[boring-cyborg]

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