GH-33726: [CI][Go] Set host name in Go benchmarks (#33728)

Closes #33726; see issue for comprehensive explanation. cc @ zeroshade 

### Rationale for this change

Go benchmarks are sending host names from runners that vary slightly, preventing us from seeing the full history of the benchmarks on Conbench.

### What changes are included in this PR?

Sets host name in Go benchmarks via environment variable so benchmark history will be available on Conbench.

### Are these changes tested?

Yes, for the benchadapt code that will pick it up: https://github.com/conbench/conbench/blob/main/benchadapt/python/tests/test_result.py#L107-L114

### Are there any user-facing changes?

No
* Closes: #33726

Authored-by: Edward Visel <1693477+alistaire47@users.noreply.github.com>
Signed-off-by: Jacob Wujciak-Jens <jacob@wujciak.de>

.github/workflows/go.yml

@@ -96,6 +96,7 @@ jobs:
           CONBENCH_EMAIL: ${{ secrets.CONBENCH_EMAIL }}
           CONBENCH_PASSWORD: ${{ secrets.CONBENCH_PASS }}
           CONBENCH_REF: ${{ github.ref_name }}
+          CONBENCH_MACHINE_INFO_NAME: amd64-debian-11
         run: |
           pip install benchadapt@git+https://github.com/conbench/conbench.git@main#subdirectory=benchadapt/python
           python ci/scripts/go_bench_adapt.py
@@ -266,6 +267,7 @@ jobs:
           CONBENCH_EMAIL: ${{ secrets.CONBENCH_EMAIL }}
           CONBENCH_PASSWORD: ${{ secrets.CONBENCH_PASS }}
           CONBENCH_REF: ${{ github.ref_name }}
+          CONBENCH_MACHINE_INFO_NAME: amd64-macos-11
         run: |
           pip install benchadapt@git+https://github.com/conbench/conbench.git@main#subdirectory=benchadapt/python
           python ci/scripts/go_bench_adapt.py