Remove invalid HasField check on proto3 scalar metric value (#254) #633

Job	Run time
Test with nox (amd64, ubuntu-24.04, 3.12, pytest_min)	36s
Build distribution packages	19s
Test with nox (amd64, ubuntu-24.04, 3.11, pytest_min)	37s
Test with nox (arm, ubuntu-24.04, 3.11, pytest_min)	36s
Test with nox (amd64, ubuntu-24.04, 3.11, ci_checks_max)	1m 3s
Test with nox (arm, ubuntu-24.04, 3.11, ci_checks_max)	1m 12s
Test with nox (amd64, ubuntu-24.04, 3.12, ci_checks_max)	1m 9s
Test with nox (arm, ubuntu-24.04, 3.12, ci_checks_max)	1m 9s
Test with nox (arm, ubuntu-24.04, 3.12, pytest_min)	41s
Test documentation website generation	-1s
Test package installation (amd64, ubuntu-24.04, 3.11)	20s
Test package installation (arm, ubuntu-24.04, 3.11)	22s
Test package installation (arm, ubuntu-24.04, 3.12)	21s
Test package installation (amd64, ubuntu-24.04, 3.12)	17s
Test package installation	2s
Test with nox	2s
Publish documentation website to GitHub pages	29s
Publish packages to PyPI	0s
Create GitHub release	0s
	9m 14s

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