Warn if the WASI SDK version to be used doesn't match the officially tested version

[brettcannon]

Starting with WASI SDK 25, a VERSION file is included with WASI SDK. We can use that to warn users that they are about to use an unsupported version.

Linked PRs

• GH-140768: Warn when the WASI SDK version doesn't match the supported version #140769
• [3.14] GH-140768: Warn when the WASI SDK version doesn't match the supported version (GH-140769) #140801