Automated cherry pick of #3777: chart: fix karmada search external etcd no volume mount

[my-git9]

Cherry pick of #3777 on release-1.6.
#3777: chart: fix karmada search external etcd no volume mount
For details on the cherry pick process, see the cherry pick requests page.

Chart: Fixed the issue that `karmada-search` no ETCD secret volume mount when using external ETCD.

[codecov-commenter]

Codecov Report

Merging #3784 (1479cb8) into release-1.6 (fdc7ac6) will decrease coverage by 0.02%.
The diff coverage is n/a.

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@@               Coverage Diff               @@
##           release-1.6    #3784      +/-   ##
===============================================
- Coverage        55.21%   55.19%   -0.02%     
===============================================
  Files              221      221              
  Lines            20834    20834              
===============================================
- Hits             11503    11499       -4     
- Misses            8719     8723       +4     
  Partials           612      612              

Flag	Coverage Δ
unittests	55.19% <ø> (-0.02%)	⬇️

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see 1 file with indirect coverage changes

[Poor12]

LGTM
Please add the release note.

[my-git9]

LGTM Please add the release note.

Updated, thanks

[Poor12]

/lgtm
/approve

[karmada-bot]

[APPROVALNOTIFIER] This PR is APPROVED

This pull-request has been approved by: Poor12

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