(ecs): TagParameterContainerImage does not support digest

### Describe the bug

[TagParameterContainerImage ](https://github.com/aws/aws-cdk/blob/main/packages/aws-cdk-lib/aws-ecs/lib/images/tag-parameter-container-image.ts) uses CloudFormation parameter as the provider for the tag, but unlike [EcrImage](https://github.com/aws/aws-cdk/blob/main/packages/aws-cdk-lib/aws-ecs/lib/images/ecr.ts) which correctly uses [repositoryUriForTagOrDigest](https://github.com/aws/aws-cdk/blob/main/packages/aws-cdk-lib/aws-ecs/lib/images/ecr.ts#L26) to support both tag (`latest`) or digest (`sha256:...`), TagParameterContainerImage uses [repositoryUriForTag](https://github.com/aws/aws-cdk/blob/main/packages/aws-cdk-lib/aws-ecs/lib/images/tag-parameter-container-image.ts#L32) instead.

I will create the PR shortly for this bug/issue.

### Regression Issue

- [ ] Select this option if this issue appears to be a regression.

### Last Known Working CDK Library Version

_No response_

### Expected Behavior

I expect `TagParameterContainerImage` to support both tag or digest. I'd rather not create a new class `TagOrDigestParameterContainerImage`; I'd rather modify the existing `TagParameterContainerImage` to make it work with either, similar to how [EcrImage](https://github.com/aws/aws-cdk/blob/main/packages/aws-cdk-lib/aws-ecs/lib/images/ecr.ts) currently supports both.

### Current Behavior

`TagParameterContainerImage` does not support digest. It will suffix the `imageName` like this: `dkr.ecr.us-west-2.amazonaws.com/repo:sha256:1af7227` while the correct value should be `dkr.ecr.us-west-2.amazonaws.com/repo@sha256:1af7227`.

### Reproduction Steps

Unfortunately I can't use unit test to show this since unit test only synths, not deploy with parameters.

### Possible Solution

_No response_

### Additional Information/Context

_No response_

### AWS CDK Library version (aws-cdk-lib)

aws-cdk-lib@2.248.0

### AWS CDK CLI version

2.1119.0 (build 820ac02)

### Node.js Version

v24.15.0

### OS

6.6.87.2-microsoft-standard-WSL2

### Language

TypeScript

### Language Version

_No response_

### Other information

_No response_

Start with packages/aws-cdk-lib/aws-ecs/lib/images/tag-parameter-container-image.ts and compare its repository URI handling with EcrImage in packages/aws-cdk-lib/aws-ecs/lib/images/ecr.ts. Check how the CloudFormation parameter is incorporated, then verify that tag values retain the tag form and digest values use the digest form; the issue notes that unit tests only synthesize and do not deploy parameters.

Written by the indexing model from the issue text.