Remove ignore rule for identifier_external_ids column

Rushik Subbarequested to merge
srushik/remove_ignore_rule_on_identifier_external_ids_column into master

What does this MR do and why?

Removes the ignore_rule on identifer_external_ids column. Column was removed in 17.5 !164883 (merged)

Relates to #500022 (closed)

Edited by Rushik Subba

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