`hls-cabal-plugin`: `autogen-module` completion is missing

[fendor]

The completion doesn't seem to include autogen-modules.

Your environment

HLS 2.9.0.1

Which OS do you use?
Arch Linux
Which version of GHC do you use and how did you install it?
9.6.6
How is your project built (alternative: link to the project)?
cabal

Steps to reproduce

In any correct .cabal file stanza, write:

library my-lib
  autogen

Expected behaviour

Should offer completion for the autogen-modules key

Note: I don't expect completions for the modules within a autogen-modules field. That's probably impossible.

Actual behaviour

Does not offer the completion

[fendor]

Same issue for autogen-includes

[fendor]

Closed by #4587