Update schema to classify `security_training_providers` and `security_trianings`

Subashis Chakrabortyrequested to merge
476672-sec-train-prov into master

This is basically the revert of Transition security_trainings and security_trai... (!160207 - merged) • Schmil Monderer • 17.3. I introduced an new migration to reintroduce the index that was removed.

Related to #476672 (closed)

Edited by Subashis Chakraborty

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