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GH-43059: [CI][Gandiva] Disable Python Gandiva tests on AlmaLinux 8 (#43093)

### Rationale for this change

The newer version of LLVM on AlmaLinux 8 fails on the pyarrow.gandiva tests

### What changes are included in this PR?

Temporarily remove Gandiva on Python checks for AlmaLinux 8.

### Are these changes tested?

Via CI
### Are there any user-facing changes?

No
* GitHub Issue: #43059

Authored-by: Raúl Cumplido <raulcumplido@gmail.com>
Signed-off-by: Sutou Kouhei <kou@clear-code.com>