[UI] Add tooltip to Energymonitor

[Sn0w3y]

This "fix" Adresses Issue

[codecov[bot]]

Codecov Report

:white_check_mark: All modified and coverable lines are covered by tests.

Additional details and impacted files

@@              Coverage Diff              @@
##             develop    #3392      +/-   ##
=============================================
+ Coverage      59.82%   59.86%   +0.05%     
  Complexity       112      112              
=============================================
  Files           2787     2787              
  Lines         121037   121037              
  Branches        9061     9061              
=============================================
+ Hits           72400    72452      +52     
+ Misses         45932    45869      -63     
- Partials        2705     2716      +11     

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[sfeilmeier]

I'm marking this as draft for now till we finish discussion at https://github.com/OpenEMS/openems/issues/3387, because I agree with

What's the commonality between a joke and a UI? -- If you have to explain it, it's not good.

[janklostermann]

Wouldn't it be helpful to just merge this PR as a quick fix to instantly help people having this question? Of cause this should not stop the started discussion nor prevent a better solution! (I do agree to the UX issue.)