Record experiment subjects in the database for GLEX experiments

Alex Buijsrequested to merge
294154-use-experiments-tables-with-glex into master

What does this MR do?

It adds a record! method to the ApplicationExperiment class, so we can record the experiment subject in the experiment_subjects table if the context of the experiment contains a namespace, group, project, actor or user.

Issues: #294154 (closed) #330914

Edited by Alex Buijs

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