Error when defining a custom location of configfile and analyzing files inside same location

[gian1200]

Continuation of #1932

Issue happens when setting config file in a custom location (e.g. <project-path>\.config\eslint.config.mjs)

I think I've pin point the issue. It happens only for files inside .config folder. For any file outside, VSCode-ESLint works fine.

Steps to reproduce:

1. git clone reproducer
2. cd reproduce-vscode-eslint-issue and npm install inside the root folder
3. code . --> open the project on VSCode and make sure vscode-eslint is enabled (wait for everything to load). If not loaded, a VSCode reload might be necessary.
4. Open files for testing:
   • src/dummy.mjs: It is flagged correctly by VSCode-ESLint
   • .config/anotherDummyFile.mjs: This file is not flagged at all (see Output for error)
5. Execute npm run eslint: both files are correctly flagged