[flang] Remove legacy (non-HLFIR) lowering options from tests (#196137) Update flang LIT tests to drop references to compiler options that controlled legacy non-HLFIR lowering: `-flang-experimental-hlfir`, `-flang-deprecated-no-hlfir`, the bbc `-hlfir`/`--hlfir` switch, and `--use-desc-for-alloc=false`. The dropped flags were either no-ops or selected behavior that is now the only supported lowering path. Delete `Driver/hlfir-no-hlfir-error.f90`, which existed solely to test mutual exclusion of `-flang-experimental-hlfir` and `-flang-deprecated-no-hlfir`. This commit contains only test changes; the option/code removal will be done in separate commits. Assisted-by: AI
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