Remove invalid releases automatically (#466)

Automatically remove empty releases or releases which are released in the future, regardless of the product.

Also refactored a bit releasedata.py to use better names and clarify types.

update-release-data.py

@@ -112,6 +112,7 @@ def run_scripts(summary: GitHubStepSummary, products: list[ProductFrontmatter])
 
         # Add default configs
         configs = [AutoConfig(product.name, {"_copy_product_releases": ""})] + configs
+        configs = configs + [AutoConfig(product.name, {"_remove_invalid_releases": ""})]
 
         with GitHubGroup(product.name):
             try: