fix: admin export and import applications and applicationsets from other namespaces

[ilia-medvedev-codefresh]

Closes #14596

Checklist:

• Either (a) I've created an enhancement proposal and discussed it with the community, (b) this is a bug fix, or (c) this does not need to be in the release notes.
• The title of the PR states what changed and the related issues number (used for the release note).
• The title of the PR conforms to the Toolchain Guide
• I've included "Closes [ISSUE #]" or "Fixes [ISSUE #]" in the description to automatically close the associated issue.
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[pasha-codefresh]

@CodiumAI-Agent /review

[CodiumAI-Agent]

PR Reviewer Guide 🔍

⏱️ Estimated effort to review: 4 🔵🔵🔵🔵⚪

🧪 PR contains tests

🔒 Security concerns No specific security vulnerabilities identified in the PR code, but ensure that all new network interactions, file operations, and data processing are secure and validate inputs appropriately.

⚡ Key issues to review Error Handling The use of errors.CheckError(err) directly after operations like dynamic.NewForConfig(config) or acdClients.configMaps.Get(ctx, common.ArgoCDConfigMapName, v1.GetOptions()) could lead to termination of the program. Consider handling errors gracefully without exiting the program, especially in a command-line application where returning an error message might be more appropriate. Security Concern The function redactor in the iterateStringFields method is designed to mask secrets in configurations. Ensure that all sensitive fields are considered and that this method is thoroughly tested to prevent accidental exposure of sensitive data. Namespace Handling The logic for handling namespaces in the export and import commands seems complex and could be prone to errors, especially with the manual string manipulations and checks. Consider simplifying this logic or using existing Kubernetes utilities that handle namespace filtering.

[pasha-codefresh]

@ilia-medvedev-codefresh please run

make lint-local
make codegen-local

Let me know if help needed

[codecov]

Codecov Report

Attention: Patch coverage is 23.91304% with 70 lines in your changes missing coverage. Please review.

Project coverage is 55.79%. Comparing base (588b251) to head (246607a).
Report is 515 commits behind head on master.

Files with missing lines	Patch %	Lines
cmd/argocd/commands/admin/backup.go	0.00%	66 Missing ⚠️
cmd/argocd/commands/admin/admin.go	84.61%	4 Missing ⚠️

Additional details and impacted files

@@            Coverage Diff             @@
##           master   #19510      +/-   ##
==========================================
- Coverage   55.80%   55.79%   -0.02%     
==========================================
  Files         316      316              
  Lines       43682    43737      +55     
==========================================
+ Hits        24376    24401      +25     
- Misses      16743    16773      +30     
  Partials     2563     2563              

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[reggie-k]

LGTM.
As per discussion with Pasha, it would be beneficial for the "import --prune" option to have an "Are you sure" prompt, listing the number of the resources that are expected to be deleted.
Opening a separate issue for that (since adding a prompt is a breaking change for CI/other automations).