[DO NOT MERGE] Revert EUSC changes

[alexxa]

to unblock the package validation.

DO NOT MERGE this one, otherwise our Jenkins won't work for EUSC region

[sourcery-ai]

Hey - I've left some high level feedback:

• Reverting the escaped variables back to direct interpolation in ci/aws.sh reintroduces the risk of Jenkins/Groovy baking secrets into logs/config; consider keeping the escaping while still adjusting the EUSC-specific behavior you need to revert.
• Instead of fully removing the STS_ENDPOINT logic and EUSC-specific endpoints in aws_config_builder.py, consider feature-flagging or gating the EUSC behavior so you can temporarily disable it for validation without breaking that region for future runs.
• You added JIRA_PAT to the container environment in ci/aws.sh but it is not used by cloud-image-val.py in this change set; either wire it through where needed or drop it from this PR to avoid confusion about unused secrets.

Prompt for AI Agents

Please address the comments from this code review:

## Overall Comments
- Reverting the escaped variables back to direct interpolation in `ci/aws.sh` reintroduces the risk of Jenkins/Groovy baking secrets into logs/config; consider keeping the escaping while still adjusting the EUSC-specific behavior you need to revert.
- Instead of fully removing the `STS_ENDPOINT` logic and EUSC-specific endpoints in `aws_config_builder.py`, consider feature-flagging or gating the EUSC behavior so you can temporarily disable it for validation without breaking that region for future runs.
- You added `JIRA_PAT` to the container environment in `ci/aws.sh` but it is not used by `cloud-image-val.py` in this change set; either wire it through where needed or drop it from this PR to avoid confusion about unused secrets.

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