[2168484] VM -> Metrics tab: Add dates to the X axis

Description of problem:
If users set the time range to "Last 1 week", without dates to the X axis, it becomes hard to read. Ref to other metrics like CPU usage in “Observe” -> “Dashboards” for example.

Version-Release number of selected component (if applicable):

How reproducible:

Steps to Reproduce:
1. view vm metrics tab and select time range to 1 week
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Actual results:

Expected results:
add date to the x axis

Additional info: