courses: smoother tags selecting (fixes #9765) (#9762) #9059

Job	Run time
Preparing	3s
Chat API build (arm, treehouses/node-tags:arm-3.16)	2m 27s
Chat API build (arm64, treehouses/node-tags:arm64-3.16)	2m 48s
Chat API build (amd64, treehouses/node:3.16)	46s
Manifest build	5s
	6m 9s

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