Decouple the figure helper loader from include_plotlyjs #440

Job	Run time
env-prepare	3s
source-test (ubuntu-24.04)	2m 56s
source-test (windows-2022)	6m 7s
source-test (macos-15)	2m 57s
package-test (windows-2022)	5m 9s
package-test (ubuntu-24.04)	2m 44s
package-test (macos-15)	3m 0s
run-reusable-workflows / dashboard	2m 48s
	25m 44s

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