Enforce minimum go version when runnign cmake if go is not disabled

[andrewhop]

Description of changes:

The version specified in go.mod isn't enforced and users can hit weird issues when building AWS-LC with old versions of go:

long build output
 util/embed_test_data.go:81:16: undefined: os.ReadFile
more build output
...
 make: *** [Makefile:117: all] Error 2
BUILD FAILED 

This is confusing because the go error can be easily overlooked.

Call-outs:

This change isn't changing what version of Go builders need, just making the requirement more clear.

Testing:

Built locally and verified output -- Go compiler 1.21.3 found I also tried raising the minimum version to 1.180 and verified it failed:

CMake Error at cmake/go.cmake:28 (message):
  Go compiler version must be at least 1.180.  Found version 1.21.3
Call Stack (most recent call first):
  CMakeLists.txt:26 (include)

And if you disable go the configure passes and checks nothing.

By submitting this pull request, I confirm that my contribution is made under the terms of the Apache 2.0 license and the ISC license.