Add image-pull-policy field for karmada-operator

[seanlaii]

What type of PR is this?

/kind feature

What this PR does / why we need it: https://github.com/karmada-io/karmada/issues/4789

Which issue(s) this PR fixes: Part of https://github.com/karmada-io/karmada/issues/4789

Special notes for your reviewer:

Does this PR introduce a user-facing change?:

Allow the user to specify `imagePullPolicy` in Karmada CR when installing via karmada-operator.

[karmada-bot]

Welcome @seanlaii! It looks like this is your first PR to karmada-io/karmada 🎉

[XiShanYongYe-Chang]

@seanlaii Thanks a lot~ /cc @calvin0327 @zhzhuang-zju

[codecov-commenter]

Codecov Report

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

Project coverage is 52.98%. Comparing base (20bb7a7) to head (d78ea38). Report is 16 commits behind head on master.

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Additional details and impacted files

```diff @@ Coverage Diff @@ ## master #4863 +/- ## ========================================== - Coverage 53.05% 52.98% -0.08% ========================================== Files 250 250 Lines 20371 20421 +50 ========================================== + Hits 10808 10820 +12 - Misses 8845 8882 +37 - Partials 718 719 +1 ``` | [Flag](https://app.codecov.io/gh/karmada-io/karmada/pull/4863/flags?src=pr&el=flags&utm_medium=referral&utm_source=github&utm_content=comment&utm_campaign=pr+comments&utm_term=karmada-io) | Coverage Δ | | |---|---|---| | [unittests](https://app.codecov.io/gh/karmada-io/karmada/pull/4863/flags?src=pr&el=flag&utm_medium=referral&utm_source=github&utm_content=comment&utm_campaign=pr+comments&utm_term=karmada-io) | `52.98% <ø> (-0.08%)` | :arrow_down: | Flags with carried forward coverage won't be shown. [Click here](https://docs.codecov.io/docs/carryforward-flags?utm_medium=referral&utm_source=github&utm_content=comment&utm_campaign=pr+comments&utm_term=karmada-io#carryforward-flags-in-the-pull-request-comment) to find out more.

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[zhzhuang-zju]

@seanlaii nice job~ /lgtm

btw, we can continous to push forward https://github.com/karmada-io/karmada/pull/4401 to add validation of the installation method of the operatoris installed. @XiShanYongYe-Chang

[zhzhuang-zju]

/lgtm

[calvin0327]

/lgtm

thanks for doing this.

[karmada-bot]

[APPROVALNOTIFIER] This PR is APPROVED

This pull-request has been approved by: RainbowMango

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Needs approval from an approver in each of these files: - ~~[charts/OWNERS](https://github.com/karmada-io/karmada/blob/master/charts/OWNERS)~~ [RainbowMango] - ~~[operator/OWNERS](https://github.com/karmada-io/karmada/blob/master/operator/OWNERS)~~ [RainbowMango] - ~~[operator/pkg/apis/OWNERS](https://github.com/karmada-io/karmada/blob/master/operator/pkg/apis/OWNERS)~~ [RainbowMango] Approvers can indicate their approval by writing `/approve` in a comment Approvers can cancel approval by writing `/approve cancel` in a comment