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GH-33920: [C++][CI] Disable Flight SQL in sanitizer job (#34014)

### Rationale for this change

We want to reduce CI time.

### What changes are included in this PR?

This disables Flight SQL to use system gRPC and ProtoBuf.
We can reduce build time by avoiding bundled gRPC and ProtoBuf.

### Are these changes tested?

Yes.

### Are there any user-facing changes?

No.
* Closes: #33920

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