add spark2.4.6 to maven-publish-scala (#5138)
add spark2.4.6 to maven-publish-scala (#5138)

* add spark2.4.6 build with maven

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yangw1234/BigDL,intel-analytics/BigDL,yangw1234/BigDL,intel-analytics/BigDL,intel-analytics/BigDL,yangw1234/BigDL,yangw1234/BigDL,intel-analytics/BigDL