fix(2120): prise ne compte de la part variable du salaire dans le calcul du SRef #5471

Job	Run time
Lint Dockerfile	10s
Register elasticsearch	24s
Build	2m 39s
Build Storybook	1m 2s
Lint (@socialgouv/cdtn-ui)	36s
Lint (@cdt/frontend)	1m 3s
Test (@socialgouv/cdtn-ui)	1m 23s
Test (@cdt/frontend)	5m 39s
Lint (@socialgouv/modeles-social)	53s
Check typescript types (@cdt/frontend)	29s
Check typescript types (@socialgouv/modeles-social)	33s
Test (@socialgouv/modeles-social)	9m 42s
Check typescript types (@socialgouv/cdtn-utils)	22s
Check typescript types (@socialgouv/cdtn-ui)	26s
	25m 21s

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