[vcpkg|manifest] Improve error messages

[Neumann-A]

The following error did not tell me anything:

1> [CMake] Error: There are invalid field types in the CONTROL or manifest file of E:\Repos\StoPhys\vcpkg_manifest\vcpkg.json
1> [CMake] The following fields had the wrong types:
1> [CMake] 
1> [CMake]     dependencies was expected to be an array of dependencies
1> [CMake]     name was expected to be an identifier
1> [CMake] 

Solution:
every "name": "<value>" field must have a with only lowercase characters. The error message did not really help here.

[JackBoosY]

See #12460.

[linquize]

What is your vcpkg.json?

[JackBoosY]

Since #12460 meged, I think I can close this issue.

[JackBoosY]

We still have some problems when printing this information in the pipeline, please wait for me to fix it.