Updating behavior or dashboard to not be so intrusive.

[safaci2000]

Previous behavior:

1. Delete all monitored dashboards
2. Upload all dashboards from backup.

New Behavior:

1. Upload all dashboards from backup overwriting existing Dashboards.
2. Delete any dashboards that exists in grafana but are missing from backup.

[codecov]

Codecov Report

Attention: Patch coverage is 50.00000% with 6 lines in your changes missing coverage. Please review.

Project coverage is 47.55%. Comparing base (0bb1b07) to head (f189025).
Report is 1 commits behind head on main.

Files with missing lines	Patch %	Lines
internal/service/dashboards.go	50.00%	5 Missing and 1 partial ⚠️

Additional details and impacted files

@@            Coverage Diff             @@
##             main     #337      +/-   ##
==========================================
- Coverage   47.57%   47.55%   -0.02%     
==========================================
  Files          85       85              
  Lines        6647     6657      +10     
==========================================
+ Hits         3162     3166       +4     
- Misses       3117     3122       +5     
- Partials      368      369       +1     

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