fix: prune object again when sync policy not foreground

[penglongli]

Refer to: https://github.com/argoproj/argo-cd/issues/17465

[sonarqubecloud[bot]]

Quality Gate passed

Issues
0 New issues
0 Accepted issues

Measures
0 Security Hotspots
No data about Coverage
0.0% Duplication on New Code

See analysis details on SonarCloud

[codecov[bot]]

Codecov Report

All modified and coverable lines are covered by tests :white_check_mark:

Project coverage is 54.74%. Comparing base (5fd9f44) to head (ab0fe3c).

Additional details and impacted files

@@            Coverage Diff             @@
##           master     #567      +/-   ##
==========================================
+ Coverage   54.71%   54.74%   +0.02%     
==========================================
  Files          41       41              
  Lines        4834     4837       +3     
==========================================
+ Hits         2645     2648       +3     
  Misses       1977     1977              
  Partials      212      212              

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