Hello! This PR fix #20252 .

Main Changes:
The imagePullPolicy value for ArgoCD image is overwritten based on the value of the IMAGE_PULL_POLICY environment variable when run make manifest-local command.

• default : Always
• example for override : IMAGE_PULL_POLICY=IfNotPresent make manifeset-local

I wanted to use Kustomize but couldn’t find a way, so I wrote custom Go code under the hack folder to perform the above operation. (hack/update-manifests-imagepullpolicy)

Minor Changes:
The default imagePullPolicy values were modified according to the following rules.

• Always : for latest version image (ArgoCD image)
• IfNotPresent : for version specific image
  Most settings already follow these rules, but there were a few that did not. If these exceptions were intentional, please let me know, and I will revert them to their original state.

Thank you in advance for the review.

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.
• I've updated both the CLI and UI to expose my feature, or I plan to submit a second PR with them.
• Does this PR require documentation updates?
• I've updated documentation as required by this PR.
• I have signed off all my commits as required by DCO
• I have written unit and/or e2e tests for my change. PRs without these are unlikely to be merged.
• My build is green (troubleshooting builds).
• My new feature complies with the feature status guidelines.
• I have added a brief description of why this PR is necessary and/or what this PR solves.
• Optional. My organization is added to USERS.md.
• Optional. For bug fixes, I've indicated what older releases this fix should be cherry-picked into (this may or may not happen depending on risk/complexity).