fix(sync): create namespace before dry-run

[agaudreault]

Replaces https://github.com/argoproj/gitops-engine/pull/708 reverted by https://github.com/argoproj/gitops-engine/pull/730 Fixes https://github.com/argoproj/argo-cd/issues/21788

Tested in Argo CD by https://github.com/argoproj/argo-cd/pull/23304

[codecov[bot]]

Codecov Report

Attention: Patch coverage is 78.26087% with 5 lines in your changes missing coverage. Please review.

Project coverage is 53.75%. Comparing base (8849c3f) to head (a3a3fb4). Report is 51 commits behind head on master.

Files with missing lines	Patch %	Lines
pkg/sync/sync_context.go	78.26%	3 Missing and 2 partials :warning:

Additional details and impacted files

@@            Coverage Diff             @@
##           master     #731      +/-   ##
==========================================
- Coverage   54.26%   53.75%   -0.51%     
==========================================
  Files          64       64              
  Lines        6164     6531     +367     
==========================================
+ Hits         3345     3511     +166     
- Misses       2549     2743     +194     
- Partials      270      277       +7     

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[sonarqubecloud[bot]]

Quality Gate passed

Issues
0 New issues
0 Accepted issues

Measures
0 Security Hotspots
0.0% Coverage on New Code
0.0% Duplication on New Code

See analysis details on SonarQube Cloud

[agaudreault]

@crenshaw-dev tested in https://github.com/argoproj/argo-cd/pull/23304 and user confirmed the fix is good https://github.com/argoproj/argo-cd/issues/21788#issuecomment-2949821445