feature: Add ecs filter e2e test

[celalettin1286]

This PR is still draft.
Completed parts:

• TF scripts creates ECS cluster, supporting resources and deploys fluent-bit service with ecs filter configured with dummy plugin and cluster name from ECS metadata.
• Since ECS requires OCI image, PR introduces Dockerfile uses fluent-bit master image as base and add fluent-bit.conf.

Next steps:

• GH Action definitions for building OCI image.
• Terraform init-plan-apply steps.
• Bats scripts or GH actions step to check cloudwatch log to validate fluent-bit service.
• Move terraform scripts to terraform directory.

v2.1.0 test results(manually):
[0] dummy.data: [[1681202733.591231634, {}], {"this is"=>"dummy data", "cluster"=>"fluent-bit-ci"}]

[patrick-stephens]

Do we have to push an image to ECR to use this or can we just use one built in ghcr.io by the workflow?

[patrick-stephens]

This will only work for integration tests off master I think.
We need to be able to trigger them on a PR.