entity mapping fixes

[ddamenova]

Change(s):

• making the entity mapping stronger by breaking down the account and host entity mappings.

• getting rid of extraneous custom entity columns

  Reason for Change(s):

  • fixing entity mapping to get more alert correlations and reduce singletons

  Version Updated:

  • yes
    Testing Completed:
  • yes

  Checked that the validations are passing and have addressed any issues that are present:

  • not yet

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[v-prasadboke]

Hello @ddamenova, Is Shain or Ashwin reviewing this PR?

CC: @shainw && @ashwin-patil

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