feat: support adding additional labels to dashboard configmap

[fengxsong]

What type of PR is this?

• "feat(chart): Support adding additional labels to the dashboard ConfigMap."

What this PR does / why we need it:

If we use this chart along with a tool like https://github.com/kiwigrid/k8s-sidecar to automatically manage dashboards, this tool requires explicitly adding labels like 'grafana_dashboard: ""' to the ConfigMap.

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 64.97%. Comparing base (1b6bf5f) to head (e9e6233).
Report is 2 commits behind head on main.

Additional details and impacted files

@@           Coverage Diff           @@
##             main    #5317   +/-   ##
=======================================
  Coverage   64.96%   64.97%           
=======================================
  Files         213      213           
  Lines       33474    33474           
=======================================
+ Hits        21747    21750    +3     
+ Misses      10398    10396    -2     
+ Partials     1329     1328    -1     

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[arkodg]

can we use dashboard here ? because the object is not an array/map type

[fengxsong]

although the generated object is a single ConfigMap, but it creates multiple grafana dashboards, doesn't it? so I think using the plural form is more accurate.

[arkodg]

In the project we use plural only when the type of the object is array/map, this field is referring to the dashboard configuration

[fengxsong]

okay, it's been done.

[arkodg]

LGTM thanks !