config security context

[zhzhuang-zju]

What type of PR is this?
/kind cleanup

What this PR does / why we need it:
A security context defines privilege and access control settings for a Pod or Container. More details can refer to https://www.dynatrace.com/engineering/blog/kubernetes-security-part-3-security-context/

This PR restricted the component's security context, including,

• set allowPrivilegeEscalation to false
• set privileged to false,
• configured the seccompProfile to RuntimeDefault

Regarding runAsUser and runAsNonRoot, unfortunately, imposing these restrictions resulted in abnormal functionality of the component, so they could not be applied. As for readOnlyRootFilesystem, implementing this would reduce convenience during troubleshooting. Given that the manifests files maintained under the artifacts directory are primarily used by developers, this PR decides not to set this option for now.

Which issue(s) this PR fixes:
Fixes #

Special notes for your reviewer:
For other installation methods, this configuration can be adapted later, and it should provide users with the ability to customize security context.

Does this PR introduce a user-facing change?:

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Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 48.36%. Comparing base (253dc79) to head (3e9ef29).
Report is 16 commits behind head on master.

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Additional details and impacted files

@@           Coverage Diff           @@
##           master    #6052   +/-   ##
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  Coverage   48.36%   48.36%           
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  Files         666      666           
  Lines       54831    54842   +11     
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+ Hits        26519    26526    +7     
- Misses      26593    26596    +3     
- Partials     1719     1720    +1     

Flag	Coverage Δ
unittests	48.36% <ø> (+<0.01%)	⬆️

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[RainbowMango]

/lgtm
/approve

[karmada-bot]

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