feat: fix force-update for zero-replica deployments by reading image tags from spec

[chansuke]

Closes #829

Resolves continuous update attempts for deployments with 0 replicas when force-update=true is set

[codecov-commenter]

Codecov Report

❌ Patch coverage is 50.00000% with 45 lines in your changes missing coverage. Please review.
✅ Project coverage is 71.74%. Comparing base (0e94c76) to head (e01bc8f).

Files with missing lines	Patch %	Lines
pkg/argocd/argocd.go	57.74%	27 Missing and 3 partials ⚠️
pkg/argocd/update.go	21.05%	14 Missing and 1 partial ⚠️

Additional details and impacted files

@@                     Coverage Diff                     @@
##           master-annotation-based    #1172      +/-   ##
===========================================================
- Coverage                    72.23%   71.74%   -0.50%     
===========================================================
  Files                           45       45              
  Lines                         4264     4349      +85     
===========================================================
+ Hits                          3080     3120      +40     
- Misses                        1015     1056      +41     
- Partials                       169      173       +4     

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[chengfang]

@chansuke can you investigate the CI failures?

[chansuke]

@chengfang
yes:+1:

[nissessenap]

Is there any blocker for this PR? Would be really nice to get this merged.
Does it need any rethinking due to version 1.0?
Would also be nice to backport if possible, I think many of us are dragging our feet to bump to 1.0 due to a lot of changes.

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