Remove GroupDeployKey{sGroup}

Tomasz Skoruparequested to merge
tskorupa/drop-group_deploy_keys-and-group_deploy_keys_group-models into master

What does this MR do and why?

Remove GroupDeployKey{sGroup}

Pertains to #408933

Addresses #541118 (closed) && #567415 (closed)

Splitting !203576 (comment 2733387562) into two MRs to lower risk following https://docs.gitlab.com/development/migration_style_guide/#dropping-a-database-table.

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Edited by Tomasz Skorupa

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