feat: added mountPoints & dependsOn for fluentbit

[bentivoglid]

What does this PR do?

This PR adds the ability to specify additional volumes for the container in order to customize the fluentbit configuration and potentially log files in tail mode.

Motivation

In special cases, configuration modifications may be required, as "S3" mode is not available in FARGATE mode: https://docs.aws.amazon.com/AmazonECS/latest/
developerguide/firelens-taskdef.html#firelens-taskdef-customconfig

Additionally, this is necessary when you need to forward information from log files written by the application to the platform (or other outputs).

Describe how you validated your changes

Plan & Apply executed in our configuration. Default values for new properties are equals to hardcoded values in previous version.

[gabedos]

Hey @bentivoglid! Thanks for opening this PR to further improve log configuration with the Datadog ECS Fargate Terraform module. Whenever you have the chance, could you run the make docs command to update our public documentation for the new options you've exposed.

[gabedos]

/merge

[dd-devflow-routing-codex]

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2025-09-16 13:40:01 UTC ℹ️ Start processing command /merge

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2025-09-16 13:41:35 UTC ℹ️ MergeQueue: merge request added to the queue

The expected merge time in main is approximately 0s (p90).

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2025-09-16 13:44:21 UTC 🚨 MergeQueue: This merge request is in error

mergequeue build completed successfully, but the github api returned an error while merging the pr

Details

Error: PUT https://api.github.com/repos/DataDog/terraform-aws-ecs-datadog/pulls/44/merge: 405 Merge commits are not allowed on this repository. [] (Request ID: 8D12:DA8CE:3946BBF:CC560DC:68C969AE)

FullStacktrace:
activity error (type: github.GithubService_MergePullRequest, scheduledEventID: 41, startedEventID: 42, identity: 1@github-worker-56c947fbbd-82pjj@): PUT https://api.github.com/repos/DataDog/terraform-aws-ecs-datadog/pulls/44/merge: 405 Merge commits are not allowed on this repository. [] (Request ID: 8D12:DA8CE:3946BBF:CC560DC:68C969AE) (type: GitFailure, retryable: false): PUT https://api.github.com/repos/DataDog/terraform-aws-ecs-datadog/pulls/44/merge: 405 Merge commits are not allowed on this repository. [] (type: ErrorResponse, retryable: true)

[gabedos]

Thanks for your contribution @bentivoglid!