Simplifies `get_installation_name` a bit #2974

Job	Run time
Run Lint / Run Lint	10s
Build Worker / Build App	1m 9s
Codecov Startup / Codecov Startup	15s
Test / Test	5m 19s
Push Production Image	0s
Push Staging Image	0s
Build Self Hosted Worker / Build Self Hosted App	1m 40s
Build Self Hosted Worker / Push Self Hosted Release Image	0s
Build Self Hosted Worker / Push Self Hosted Image	0s
Push Self Hosted Image	0s
	8m 33s

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