Test the randstr.go RandomString function #2144

Job	Run time
lint-receptorctl	19s
lint-receptorctl	19s
lint-receptor	17s
lint-receptor	17s
container	2m 52s
container	2m 52s
receptor (Go 1.19)	9m 48s
receptor (Go 1.19)	8m 56s
receptor (Go 1.20)	10m 17s
receptor (Go 1.20)	10m 17s
receptorctl (Python ${{ matrix.python-version }})	0s
receptorctl (Python 3.8)	1m 7s
receptorctl (Python 3.9)	1m 10s
	48m 31s

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