Ignore author email column on gpg_signatures table

Gavin Hinfeyrequested to merge
550368_ignore_author_email_column_on_gpg_signatures_table into master

What does this MR do and why?

What

Ignore the author_email column on the gpg_signatures table.

Why

Following discussion in the related issue, it was determined that we should be checking committer email rather than author email for commit signature verification when mailmapped commits are enabled. The committer_email column will be added in Add committer email column to gpg signatures table (!198688 - merged)

This begins the process of dropping the now unneeded author_email column following the documented process.

Step 1 is ignoring the column in the model.

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Related to Rename columns `author_email` on ssh_signature ... (#550368 - closed)

Edited by Gavin Hinfey

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