🌱 support set imagepullsecret credential in helm chart and run e2e using helm chart

[zhiweiyin318]

Summary

1. support set imagepullsecret credential in the helm chart.
2. set the token-secret length to 16 in the chart.
3. use helm chart to deploy in e2e.
4. add a flag to control if create operator CR, because do not need create klusterlet CR in e2e deploy stage. the default is to create.
5. move the chart config struct to the helper dir. the consumer will only import the helper dir.

Related issue(s)

Fixes #

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 63.85%. Comparing base (567a9a4) to head (a272209).
Report is 1 commits behind head on main.

Additional details and impacted files

@@           Coverage Diff           @@
##             main     #605   +/-   ##
=======================================
  Coverage   63.84%   63.85%           
=======================================
  Files         180      180           
  Lines       14094    14100    +6     
=======================================
+ Hits         8999     9003    +4     
- Misses       4193     4194    +1     
- Partials      902      903    +1     

Flag	Coverage Δ
unit	63.85% <100.00%> (+<0.01%)	⬆️

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[zhiweiyin318]

/assign @qiujian16

[qiujian16]

/approve
/lgtm

[openshift-ci]

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