Feature: Automate detection of obsolete versions

[theunrepentantgeek]

To this point we've taken an ad-hoc approach to version updates of supported ASO resources, bringing in the new versions when users request.

We think there's merit in investigating how we might create a report to identify when the latest version included in ASO is significantly out of date. With the azure-rest-api-specs repo available as a submodule, we have the information available to do a cross check as a pipeline stage of the generator.

Initial thoughts (from a brainstorm during our weekly sync):

• List all available newer versions
• Define a threshold (say, 1 year) and highlight any resource where the newest stable version is more than that threshold newer than the latest stable version supported by ASO.
• Define a second threshold (say, 9 months) and do the same highlighting, but for preview versions
• We don't necessarily want to pull in every version (given we have hard CRD size limits we'll hit sooner or later)

[matthchr]

Generating a report someplace does sound reasonable.