[ECR] [request]: Ability to request an increase in Unique destinations across all rules in a replication configuration

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**Tell us about your request**
Currently the ECR service quota for Unique destinations across all rules in a replication configuration has a fixed value [1] and there is no option to request an increase.

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

**Tell us about the problem you're trying to solve. What are you trying to do, and why is it hard?**
When there are multiple accounts in the organization, it is necessary to replicate the images and the limit of 25 unique destinations are not enough to cover all of them. It would help if an increase for this number could be requested.

**Are you currently working around this issue?**
No

**Additional context**
N/A
**Attachments**
N/A

The issue is an ECR service-quota request, and the payload names no repository files or tests. Start by reviewing the stated 25-destination limit and the available ECR quota-request process; done means the unique-destination quota can be increased across replication rules.

Written by the indexing model from the issue text.