[llvm] [RemoveDIs][NFC] Fix rotten green C API test (PR #92362)

[Carlos Alberto Enciso via llvm-commits]

https://github.com/CarlosAlbertoEnciso commented:

General comment: in some places you use `mode` but in others you use `format`.
I would suggest to have consistent terms and options, based on the `format` term:

`new debuginfo format`.
`--test-dibuilder-debuginfo-new-format`
`--test-dibuilder-debuginfo-old-format`
`debug_info_new_format.ll`


https://github.com/llvm/llvm-project/pull/92362