Add region field when configuring pipeline server

[DaoDaoNoCode]

JIRA: https://issues.redhat.com/browse/RHOAIENG-2283

Description

Add the region field and set it as required when configuring a pipeline server, the default value is us-east-1

Also, when the endpoint is s3.amazonaws.com, we convert the host field in DSPA to add the region information in.

How Has This Been Tested?

1. Create a project
2. Configure a pipeline server
3. Make sure the region field is pre-filled and is required
4. When you submit the creation, go to DSPA to check whether the spec.objectStorage.externalStorage.host is converted. If the endpoint is s3.amazonaws.com, it should be converted. Otherwise, we keep it unchanged.

Test Impact

Add unit tests to verify the converted host is correct.

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[Gkrumbach07]

tested and works. tests look good. no UI changes needing UX. We dont validate the validity of region right now, but then again we dont validate a lot of fields besides host so i think we are fine until people start adding extra spaces to their regions too. No errors runtime errors if you throw random values into the region too.

/lgtm
/approve

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