Add additional ECS configuration values to `settings.ecs` about bottlerocket HOT 3 CLOSED

tacking this on here.......i also need support for configuring ECS_ENABLE_CONTAINER_METADATA

is there a way we can set these arbitrarily without having to make individual issues/pr's for every config available to the ecs-agent?

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@jtschelling I have reconfigured my services to use ecs_container_metadata_uri_v4.

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While working on supporting ECS_ENABLE_CONTAINER_METADATA, I realized that due to how we configure the ECS agent, this feature won't work unless we patch the ECS agent.

When the ECS agent attempts to mount the metadata file on the task's container, it will use the directory ${ECS_HOST_DATA_DIR}/${ECS_DATADIR}. In normal circumstances, the values for these environment variables will be /var/lib/ecs and /data, respectively, and the resulting path for the directory will be /var/lib/ecs/data. In Bottlerocket, we change ECS_DATADIR to be /var/lib/ecs without changing the default value of ECS_HOST_DATA_DIR. That results on the ECS agent creating the metadata file for the container at /var/lib/ecs/data/metadata, as expected, but the mounted directory will be /var/lib/ecs/var/lib/ecs/data due to the overridden ECS_DATADIR.

Setting ECS_HOST_DATA_DIR as an empty string isn't an option since that value is used by other features like Firelens.

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