Support Rails 6 `insert_all!`

Kamil Trzcińskirequested to merge
ee-insert-all-for-load-balancing into master

What does this MR do?

Adds .quote_column_name and all relevant tests to ensure that we support .insert_all! of Rails 6.

Fixes #209036 (closed)

Does this MR meet the acceptance criteria?

Conformity

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