Release pipeline: Error occurs if release with same tag name already exists

[mthalman]

In some cases, it is necessary to run the release stage multiple times, such as when there is an error at some point in the stage that requires a retry or workaround. In such a scenario, if the Create GitHub release step has already been executed from a previous run of the pipeline, it will result in the following error message:

a release with the same tag name already exists: <tag-name>

My expectation is that it should skip creation of the release and output a warning message.