fix(translator): Only log error for duplicate SNI when the certificate ID are not the same

[randmonkey]

What this PR does / why we need it:

Emit error log only when two certificates does not have the same ID but has duplicate SNI.
Resolves FTI-6500.

Which issue this PR fixes:

Special notes for your reviewer:

The current.snis = append(current.snis, cw.snis...) looks not useful. the sni field of certWrapper is not used in further translation and the SNIs of the current certificate are processed in the for _, cert := range cw.snis {...}. So I deleted it in the PR.
Since the code is too old (originally from #2580), please take a look if I have missed any context.
PR Readiness Checklist:

Complete these before marking the PR as ready to review:

• the CHANGELOG.md release notes have been updated to reflect any significant (and particularly user-facing) changes introduced by this PR

[codecov]

Codecov Report

Attention: Patch coverage is 0% with 1 line in your changes missing coverage. Please review.

Project coverage is 76.8%. Comparing base (d4d18a4) to head (a8c9e49).
Report is 83 commits behind head on main.

Files with missing lines	Patch %	Lines
internal/dataplane/translator/translate_certs.go	0.0%	0 Missing and 1 partial ⚠️

Additional details and impacted files

@@           Coverage Diff           @@
##            main   #7147     +/-   ##
=======================================
- Coverage   76.9%   76.8%   -0.1%     
=======================================
  Files        214     213      -1     
  Lines      25169   24976    -193     
=======================================
- Hits       19356   19187    -169     
+ Misses      4794    4790      -4     
+ Partials    1019     999     -20     

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