RDS purge action is broken (both purge and error handling)

[AaronCrawfis]

AB#11135

[azure-boards]

✅ Successfully linked to Azure Boards work item(s):

• GitHub Issue 11135

[AaronCrawfis]

Looks like we:

• Didn't clone the repo. We need an actions/checkout@v4 step
• Didn't set an environment variable with the GitHub token. Error message above shows how to fix this

[willdavsmith]

Not sure how I didn't see this... PR here: #970

in the meantime I manually cleared the snapshots.