Werk #12491: No autorefresh in Custom Graph editor

The custom graph editor in a pursuit of convenience would save changes and refresh the page on every change. This convenience resulted in a high performance penalty when editing graphs with multiple metrics, as the entire page would need to be rendered again, and specially recollecting data from the RRD files.

With this Werk, the custom graph editor does not execute the page reload upon changes. The user is now responsible for this interaction. Following our UX project, now there is an "Apply" button on the top left corner of the editor to save and apply the changes to the graph. This allows users to place multiple changes at once, without incurring in a performance penalty, due to the constant refreshing of the editor.

Users do need to press the "Apply" button to save changes, it is now not enough to just do changes and leave the editor.

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