feat(dashboard): manage dashboards by org_name

[Nemental]

SUMMARY

Like #318, but for grafana_dashboard :)
Instead of specifying org_id, you can use org_name...

Additionally, the grafana_dashbaord tests have been refactored

ISSUE TYPE

• Bugfix Pull Request
• Feature Pull Request

COMPONENT NAME

module: grafana_dashboard

ADDITIONAL INFORMATION

[codecov]

Codecov Report

Attention: 6 lines in your changes are missing coverage. Please review.

Comparison is base (757d7ae) 71.06% compared to head (e9b2e3b) 70.98%.

Files	Patch %	Lines
plugins/modules/grafana_dashboard.py	60.00%	3 Missing and 3 partials ⚠️

Additional details and impacted files

@@            Coverage Diff             @@
##             main     #331      +/-   ##
==========================================
- Coverage   71.06%   70.98%   -0.09%     
==========================================
  Files          18       18              
  Lines        1863     1875      +12     
  Branches      321      325       +4     
==========================================
+ Hits         1324     1331       +7     
- Misses        397      399       +2     
- Partials      142      145       +3     

Flag	Coverage Δ
integration	69.69% <60.00%> (-0.12%)	⬇️
sanity	23.58% <13.33%> (-0.13%)	⬇️
units	65.59% <ø> (ø)

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