feat: include preview versions as fallback

[bahkauv70]

No description provided.

[rubenhoenle]

deprecated = strings.EqualFold(*selectedVersion.State, VersionStateDeprecated)

Maybe a newbie question, why do you do strings.EqualFold(...) here and in line 1998 you do it like this?

return *v.State == VersionStateSupported

Apart from the fact that there is isPreview() and isSupported(), but not isDeprecated()

[bahkauv70]

Again a mixup of previously existing and newly written code. The difference is that EqualFold compares case-insensitive. However, I do not think this makes sense, as the predefined constants should match case-insensitve (they are part of the API contract). Therefore I remove the call to EqualFold to keep consistency.

[bahkauv70]

Additionally I've introduced a IsDeprecated helper function as well and replaced the checks consistently with the invocation of the helper functions. This makes the code considerably clearer