feat(helm): add service type to helm chart

[saska]

What type of PR is this?

What this PR does / why we need it:

To set the service type when using the helm chart (to NodePort, LoadBalancer to receive external traffic) unless I'm somehow misunderstanding how the helm chart is supposed to be used.

Which issue(s) this PR fixes:

Fixes #

Release Notes: Yes/No

[codecov]

Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 72.05%. Comparing base (21cbec5) to head (0cb3c20).
⚠️ Report is 20 commits behind head on main.

Additional details and impacted files

@@            Coverage Diff             @@
##             main    #7302      +/-   ##
==========================================
+ Coverage   72.01%   72.05%   +0.04%     
==========================================
  Files         230      230              
  Lines       33420    33420              
==========================================
+ Hits        24066    24081      +15     
+ Misses       7601     7589      -12     
+ Partials     1753     1750       -3     

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[zirain]

if I understand correctly, this's the service for CP, why do we need to change it?

if the user case is valid, prefer to use empty as default value, render it when user explicitly set it.

[saska]

Kubernetes' default service type is ClusterIP; I preferred to do it this way just so the documentation is explicit that it works the same as k8s would. I.e. the docs are

Key	Type	Default	Description
service.type	string	"ClusterIP"

instead of

Key	Type	Default	Description
service.type	string	""	Type of the service. Kubernetes will set this to ClusterIP if not provided.

But either way works for me.