types: remove singleton union in globals (#47282) #209

Job	Run time
changes	28s
prechecks / validate	39s
prechecks / style	55s
prechecks / bootstrap-dev-rhel8	4m 16s
prechecks / import-check	2m 47s
prechecks / audit / package-audits (windows-latest, powershell Invoke-Expression -Command "./share/spack/qa/windows_t...	5m 13s
prechecks / audit / package-audits (ubuntu-latest, bash)	8m 19s
prechecks / audit / package-audits (macos-latest, bash)	4m 53s
all-prechecks	1s
unit-tests	0s
bootstrap	0s
coverage	0s
all	0s
	27m 31s

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