NETOBSERV-648 Put unimplemented panels behind feature gates

[jpinsonneau]

This PR remove overview feature gate on its tab and adds it on the following panels:

• Network overview
• Top 5 flows distribution
• Packets dropped
• Inbound flows by region

[jotak]

Also as part of finalizing the dashboards, there's the question: do we keep all the available charts enabled by default? Or should we have some of them disabled - only available through the manage panel?

[jpinsonneau]

Also as part of finalizing the dashboards, there's the question: do we keep all the available charts enabled by default? Or should we have some of them disabled - only available through the manage panel?

As we only have 6 panels for now I think it's fine to keep everything.
With more panels we will for sure need to focus more on the order / default ones and add capabilities on view display (save / load / sizing / drag & drop etc)

[jotak]

I guess this PR can go in without these changes, but my remark was more related to the fact some panels are redundant (as discussed in slack too) - I was hoping to fix that before removing the feature gate, but that's ok, not such a big deal to do it after.

[jotak]

/lgtm

[jpinsonneau]

/approve

[openshift-ci]

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