EVEREST-302 Improve validation for backupStorage

[gen1us2k]

CHANGE DESCRIPTION

Problem:
EVEREST-302

Short explanation of the problem.

Related pull requests

• [link]

Cause:
Short explanation of the root cause of the issue if applicable.

Solution:
Short explanation of the solution we are providing with this PR.

CHECKLIST

Jira

• Is the Jira ticket created and referenced properly?

Tests

• Is an Integration test/test case added for the new feature/change?
• Are unit tests added where appropriate?

[oksana-grishchenko]

That makes API a bit weird. Why do we have exactly that 3 parameters required? It doesn't really solve the original problem described in the ticket, I mean, what if I'll do a request with the "regioon" instead of "region"? I also have a concern about the FE compatibility. We need to make sure that it's not gonna break the existing integration before 0.3 or we need to create a FE ticket for this.

Not sure we need to address the original problem though since we have the openAPI spec that describes the correct field names.

[gen1us2k]

I'm not sure either but this PR was a low-effort stuff so I decided to discuss it with you. I'll talk to QA team