Tests

add gla_householder_qr_null #890

Job	Run time
Tests (lts, windows-latest) / Julia lts - windows-latest	46m 42s
Tests (1, macOS-latest) / Julia 1 - macOS-latest	33m 54s
Tests (lts, ubuntu-latest) / Julia lts - ubuntu-latest	37m 30s
Tests (1, ubuntu-latest) / Julia 1 - ubuntu-latest	41m 28s
Tests (1, windows-latest) / Julia 1 - windows-latest	50m 57s
Tests (lts, macOS-latest) / Julia lts - macOS-latest	35m 15s
	4h 5m 46s

Provide feedback