aws_ecs_patterns: add environment parameter to ScheduledFargateTaskDefinitionOptions

### Describe the feature

Add environment variables parameter to a ScheduledFargateTask like it is possible in ScheduledFargateTaskImageOptions

### Use Case

I want to reuse a task definition for a list of tasks, but also want to hand over a list of environment variables to set it for the containers.
The same is possible in the AWS web console (Scheduled Task->Update->Container overwrites)

At the moment a new task definition is created for each task using the ScheduledFargateTaskImageOptions method.

### Proposed Solution

_No response_

### Other Information

_No response_

### Acknowledgements

- [ ] I may be able to implement this feature request
- [ ] This feature might incur a breaking change

### CDK version used

2.84

### Environment details (OS name and version, etc.)

Amazon Linux 2

Start at the ScheduledFargateTaskDefinitionOptions and ScheduledFargateTaskImageOptions entry points in aws_ecs_patterns, comparing how each accepts container configuration. Trace how ScheduledFargateTask creates task definitions and determine where an environment parameter can be applied. Done means callers can provide environment variables when reusing a task definition without creating a separate definition for each task.

Written by the indexing model from the issue text.