fix(glue-alpha): prefix validation logic is incorrect

[mikewrighton]

There was logic in aws-glue-alpha.Job that expected SparkUIProps.prefix to be specified in the form /prefix-name, instead of the more conventional prefix-name/. This fix addresses the validation and handling of this prefix field to support the correct format.

BREAKING CHANGE: SparkUIProps.prefix strings in the original /prefix-name format will now result in a validation error. To retain the same behavior, prefixes must be changed to the new prefix-name/ format.

Closes #27396.

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[scanlonp]

Change looks good. We should clean up the documentation in the SparkUIProps. Line 392 should be updated to reflect the new validation. Once that is done, feel free to merge.

✅ Updated pull request passes all PRLinter validations. Dismissing previous PRLinter review.

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