Add possibility to exclude files from parser but not from file list in Workspace.

Feature Request

📄 Brief introduction

I'm working in c code-generation for that reason I have files in format *.c with invalid proprietary language to enable/disable specific section of code from another configuration file. Also I have the testing environment in the same workspace.

I would like to know if there is any way to exclude specific files/folders using glob patterns but not hiding them from workspace (only to the parse ignore or hide problems in file). I tried with:

"files.readonlyInclude": {
  "*/oneFolder/anotherFolder/**": true
},
"C_Cpp.codeAnalysis.exclude": {
  "*/oneFolder/anotherFolder/**": true
},
"C_Cpp.files.exclude": {
  "*/oneFolder/anotherFolder/**": true
},
"search.exclude": {
  "*/oneFolder/anotherFolder/**": true
},
"files.exclude": {
  "*/oneFolder/anotherFolder/**": true
}

Last one could work but it will hide my files from workspace and I want to keep them.

⚙ Use case

To consult files and not having errors in problems section when the file is expected to have a wrong format (in this case a code-generated c source). For example:

🛠 Possible solution

A setting similar to C_Cpp.files.exclude or to files.exclude which won't report any kind of "problem" related to parser or wrong syntax.

Start by tracing how C_Cpp.files.exclude, C_Cpp.codeAnalysis.exclude, and files.exclude affect workspace visibility, parsing, and reported problems. The change is complete when a glob-based setting can suppress parser or syntax problems for matching files while keeping those files visible in the workspace.