[OS-18049] Add S3 quota tag <region>_s3_quota

So far, we have been tagging projects with S3 quota using the "s3quota" tag. Now that we have extended the availability of S3 from Meying to Prevessin, it will be handy to adopt a tag that can be used for both regions.

As a reminder, this tag is mainly used to spot projects with S3 quota set as it is otherwise impossible to identify. This helps producing S3 quota metrics. Without the tag all the projects should be iterated, indepently of having S3 quota or not.

This patch adds <region>_s3_quota (e.g. cern_s3_quota, pdc_s3_quota) to the projects to accomodate this use case from other tools like dblogger.