fix: remove expcobol language id

[ishche]

Checklist:

• Each of my commits contains one meaningful change
• I have performed rebase of my branch on top of the development
• I have performed a self-review of my own code
• I have made corresponding changes to the documentation
• My changes generate no new warnings
• I have added tests that prove my fix is effective or that my feature works
• New and existing unit tests pass locally with my changes
• I have checked my code and corrected any misspellings

[VitGottwald]

What about the code for the experimental parser. Are we keeping that or removing it as well?

[ishche]

What about the code for the experimental parser. Are we keeping that or removing it as well?

We can remove it in the next PR.