[Fargate] [Bug]: multiple container dependencies in firelens task causes the deployment to never leave PENDING state

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**Tell us about your request**

I am attempting to deploy firelens support to my existing ECS Fargate services using the 1.4.0 platform.

**Which service(s) is this request for?**
Fargate

**Tell us about the problem you're trying to solve. What are you trying to do, and why is it hard?**
Adding a `depends_on` to my main application task appears to prevent the ECS deployment from ever leaving the PENDING state. Deployments never succeed. I also ended up filing this this as Support Case #7364610971.

**Are you currently working around this issue?**
depends_on is disabled.

**Additional context**
The error handling here is ... not great. I cannot tell why my service will not start.

**Attachments**
If you think you might have additional information that you'd like to include via an attachment, please do - we'll take a look. (Remember to remove any personally-identifiable information.)

Start by reproducing the reported AWS Fargate 1.4.0 deployment with FireLens and multiple container dependencies, comparing it with the workaround that disables depends_on. The issue provides no repository files or tests; done would require identifying why the deployment remains PENDING and improving the failure behavior or error information.

Written by the indexing model from the issue text.