refs https://github.com/TryGhost/Toolbox/issues/292
- Allows to detect and extract admin api key ID value. The reason why we are not dealing withe the "secret" value here in a similar way as Content API key is to keep the package independent from the model layer. It only provides "identification" information along with the key type so that the version mismatch data service can deal with this information in an optimal way (just one db query).
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