Factor out build flags in go test commands

[pgimalac]

What does this PR do?

Factor out build flags in go test commands

Motivation

The go build and go test commands should use the same build flags, factoring both sets of args in the same variable reduces the chances of mistake.

Describe how you validated your changes

CI

Additional Notes

[agent-platform-auto-pr]

Static quality checks

✅ Please find below the results from static quality gates
Comparison made with ancestor 67ab0ae
📊 Static Quality Gates Dashboard

Successful checks

Info

	Quality gate	Change	Size (prev → curr → max)
✅	agent_deb_amd64	-703.19 KiB (0.10% reduction)	705.841 → 705.155 → 708.410
✅	agent_deb_amd64_fips	-703.19 KiB (0.10% reduction)	701.138 → 700.451 → 704.000
✅	agent_rpm_amd64	-703.19 KiB (0.10% reduction)	705.828 → 705.141 → 708.380
✅	agent_rpm_amd64_fips	-703.19 KiB (0.10% reduction)	701.125 → 700.438 → 703.990
✅	agent_rpm_arm64	-632.95 KiB (0.09% reduction)	687.324 → 686.706 → 693.520
✅	agent_rpm_arm64_fips	-636.95 KiB (0.09% reduction)	683.465 → 682.843 → 688.480
✅	agent_suse_amd64	-703.19 KiB (0.10% reduction)	705.828 → 705.141 → 708.380
✅	agent_suse_amd64_fips	-703.19 KiB (0.10% reduction)	701.125 → 700.438 → 703.990
✅	agent_suse_arm64	-632.95 KiB (0.09% reduction)	687.324 → 686.706 → 693.520
✅	agent_suse_arm64_fips	-636.95 KiB (0.09% reduction)	683.465 → 682.843 → 688.480
✅	docker_agent_amd64	-192.98 KiB (0.02% reduction)	767.575 → 767.387 → 770.720
✅	docker_agent_arm64	-141.12 KiB (0.02% reduction)	773.692 → 773.554 → 780.200
✅	docker_agent_jmx_amd64	-192.98 KiB (0.02% reduction)	958.454 → 958.266 → 961.600
✅	docker_agent_jmx_arm64	-141.12 KiB (0.01% reduction)	953.290 → 953.152 → 959.800

17 successful checks with minimal change (< 2 KiB)

	Quality gate	Current Size
✅	agent_heroku_amd64	326.864 MiB
✅	agent_msi	571.328 MiB
✅	docker_cluster_agent_amd64	180.761 MiB
✅	docker_cluster_agent_arm64	196.618 MiB
✅	docker_cws_instrumentation_amd64	7.135 MiB
✅	docker_cws_instrumentation_arm64	6.689 MiB
✅	docker_dogstatsd_amd64	38.785 MiB
✅	docker_dogstatsd_arm64	37.128 MiB
✅	dogstatsd_deb_amd64	30.004 MiB
✅	dogstatsd_deb_arm64	28.156 MiB
✅	dogstatsd_rpm_amd64	30.004 MiB
✅	dogstatsd_suse_amd64	30.004 MiB
✅	iot_agent_deb_amd64	43.002 MiB
✅	iot_agent_deb_arm64	40.123 MiB
✅	iot_agent_deb_armhf	40.704 MiB
✅	iot_agent_rpm_amd64	43.003 MiB
✅	iot_agent_suse_amd64	43.003 MiB

On-wire sizes (compressed)

	Quality gate	Change	Size (prev → curr → max)
✅	agent_deb_amd64	-166.95 KiB (0.09% reduction)	173.516 → 173.352 → 174.490
✅	agent_deb_amd64_fips	-190.17 KiB (0.11% reduction)	172.425 → 172.239 → 173.750
✅	agent_heroku_amd64	-2.45 KiB (0.00% reduction)	87.107 → 87.105 → 88.450
✅	agent_msi	+16.0 KiB (0.01% increase)	142.879 → 142.895 → 143.020
✅	agent_rpm_amd64	+66.91 KiB (0.04% increase)	176.084 → 176.149 → 177.660
✅	agent_rpm_amd64_fips	-492.76 KiB (0.27% reduction)	175.380 → 174.899 → 176.600
✅	agent_rpm_arm64	-184.85 KiB (0.11% reduction)	159.545 → 159.364 → 161.260
✅	agent_rpm_arm64_fips	-107.8 KiB (0.07% reduction)	158.869 → 158.763 → 160.550
✅	agent_suse_amd64	+66.91 KiB (0.04% increase)	176.084 → 176.149 → 177.660
✅	agent_suse_amd64_fips	-492.76 KiB (0.27% reduction)	175.380 → 174.899 → 176.600
✅	agent_suse_arm64	-184.85 KiB (0.11% reduction)	159.545 → 159.364 → 161.260
✅	agent_suse_arm64_fips	-107.8 KiB (0.07% reduction)	158.869 → 158.763 → 160.550
✅	docker_agent_amd64	-140.46 KiB (0.05% reduction)	261.166 → 261.029 → 262.450
✅	docker_agent_arm64	-152.16 KiB (0.06% reduction)	250.217 → 250.068 → 252.630
✅	docker_agent_jmx_amd64	-141.89 KiB (0.04% reduction)	329.801 → 329.662 → 331.080
✅	docker_agent_jmx_arm64	-155.86 KiB (0.05% reduction)	314.841 → 314.689 → 317.270
✅	docker_cluster_agent_amd64	neutral	63.849 MiB
✅	docker_cluster_agent_arm64	neutral	60.147 MiB
✅	docker_cws_instrumentation_amd64	neutral	2.994 MiB
✅	docker_cws_instrumentation_arm64	neutral	2.726 MiB
✅	docker_dogstatsd_amd64	neutral	15.017 MiB
✅	docker_dogstatsd_arm64	neutral	14.348 MiB
✅	dogstatsd_deb_amd64	neutral	7.937 MiB
✅	dogstatsd_deb_arm64	neutral	6.816 MiB
✅	dogstatsd_rpm_amd64	neutral	7.948 MiB
✅	dogstatsd_suse_amd64	neutral	7.948 MiB
✅	iot_agent_deb_amd64	-2.08 KiB (0.02% reduction)	11.265 → 11.263 → 12.040
✅	iot_agent_deb_arm64	neutral	9.632 MiB
✅	iot_agent_deb_armhf	+2.32 KiB (0.02% increase)	9.825 → 9.828 → 10.620
✅	iot_agent_rpm_amd64	+2.95 KiB (0.03% increase)	11.278 → 11.281 → 12.060
✅	iot_agent_suse_amd64	+2.95 KiB (0.03% increase)	11.278 → 11.281 → 12.060