fix: update assertion in _metric_chart.js #14416

Job	Run time
Run cypress tests (osd:ciGroup1)	19m 10s
Run cypress tests (osd:ciGroup2)	21m 49s
Run cypress tests (osd:ciGroup3)	20m 31s
Run cypress tests (osd:ciGroup4)	18m 50s
Run cypress tests (osd:ciGroup5)	18m 6s
Run cypress tests (osd:ciGroup6)	34m 28s
Run cypress tests (osd:ciGroup7)	22m 20s
Run cypress tests (osd:ciGroup8)	21m 22s
Run cypress tests (osd:ciGroup9)	21m 9s
Run cypress tests (osd:ciGroup10)	1h 37m 54s
Run cypress tests (osd:ciGroup11)	18m 49s
Run cypress tests (osd:ciGroup12)	1h 23m 9s
Run cypress tests (osd:ciGroup13)	1h 14m 9s
Run cypress tests (osd:ciGroup14)	31m 34s
Run cypress tests (osd:ciGroup15)	1h 50m 11s
add-comment	0s
	10h 13m 31s

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