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GH-38210: [C++][FlightRPC] Add missing app_metadata arguments (#38231)



### Rationale for this change

I have fixed the error occurring when using the "DARROW_FLIGHT_SQL=ON" option on a Mac with ARM Architecture CPU.

### What changes are included in this PR?

It seems that implicit values are not recognized in this environment (Mac ARM), so I have added values explicitly.

### Are these changes tested?

yes (build and run unit test)

### Are there any user-facing changes?

No

* Closes: #38210

Authored-by: Hyunseok Seo <hsseo0501@gmail.com>
Signed-off-by: David Li <li.davidm96@gmail.com>