Remove unnecessary backend requests from metricstore

[jvalkeal]

We're currently requesting all needed metrics from HQU backend within the used timer threshold without making any clever decisions whether it's needed or not.

e.g. 1. if collection time is 10min, no need to request metric every time. 2. if metric is requested but not changed, no need to post it to metric topics.

[jvalkeal]

Some work has been done previously but side effect was delayed start for widgets to show up any status. Now it may take up to 1 min to receive anything from backend when player is started.

[jvalkeal]

Need to move this to future. Initial status is now handled faster but to combine multiple request to one needs some architectural changes. Especially for error handling since one metric may fail the whole update request.