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Add an option to protected branches to add writing deploy keys to the whitelist for pushing. Please note this is technically a breaking change: previously if the owner of a repository was on the whitelist then any writing deploy key was effectively on the whitelist. This option will now need to be set if that is desired. Closes #8472 Details: * Allow Protected Branches to Whitelist Deploy Keys * Add migration * Ensure that IsDeployKey is set to false on the http pushes * add not null default false