make metrics-adapter chart installation optional

[yizhang-zen]

What type of PR is this?
/kind bug

What this PR does / why we need it:
With this change in v1.8: #4303, karmada-metrics-adapter is part of the helm chart when install karmada.

This change is to make karmada-metrics-adapter installation in components with host when set.

Special notes for your reviewer:

Does this PR introduce a user-facing change?:

`Helm Chart`: Make `karmada-metrics-adapter` installation optional with host mode.

[RainbowMango]

cc @jwcesign @chaosi-zju for help

[codecov-commenter]

Codecov Report

All modified and coverable lines are covered by tests ✅

Comparison is base (1cafe7f) 51.87% compared to head (7209521) 51.87%.
Report is 2 commits behind head on master.

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Additional details and impacted files

@@            Coverage Diff             @@
##           master    #4375      +/-   ##
==========================================
- Coverage   51.87%   51.87%   -0.01%     
==========================================
  Files         243      243              
  Lines       24114    24114              
==========================================
- Hits        12510    12508       -2     
- Misses      10922    10923       +1     
- Partials      682      683       +1     

Flag	Coverage Δ
unittests	51.87% <ø> (-0.01%)	⬇️

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[chaosi-zju]

/lgtm

[jwcesign]

/lgtm

By the way, I think this is not a bug, it's an enhancement

[RainbowMango]

/approve

[karmada-bot]

[APPROVALNOTIFIER] This PR is APPROVED

This pull-request has been approved by: RainbowMango

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