fix: update slack image upload to use new API #256
+501
−249
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The old
files.upload
API is deprecated and will be removed soon. It doesn't work for new slack workspaces created after May 2024.The new flow requires a 3 step process:
files.getUploadURLExternal
to get the upload URL and file ID.files.completeUploadExternal
to complete the upload and link it to the thread.Addresses #255, #235, and grafana/grafana#93398