test/e2e/karmadactl_test.go: test apply command

[mohamedawnallah]

Description

In this commit, we add e2e tests for the karmadactl apply command to ensure it handles various scenarios correctly. The tests include:

• Applying configurations without propagating them into member clusters.
• Applying configurations with propagation into specific member clusters.
• Applying configurations and propagating them to all member clusters.
• Verifying that no resources were created during --dry-run mode.
• Ensuring the command returns an error for an invalid flag.
• Ensuring the command returns an error when the specified file does not exist.
• Applying configurations with the --namespace flag to ensure resources are created in the specified namespace.
• Applying configurations with the --force-conflicts flag to ensure conflicts are forcefully resolved during server-side apply.
• Applying configurations using the --kustomize flag to process a kustomization directory.

What type of PR is this?

/kind failing-test

Which issue(s) this PR fixes:

Part of #4544

Does this PR introduce a user-facing change?:

NONE

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Codecov Report

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

Project coverage is 29.82%. Comparing base (6318541) to head (c325eee). Report is 7 commits behind head on master.

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Additional details and impacted files

```diff @@ Coverage Diff @@ ## master #5250 +/- ## ========================================== + Coverage 29.67% 29.82% +0.15% ========================================== Files 632 632 Lines 43936 43936 ========================================== + Hits 13037 13106 +69 + Misses 29954 29873 -81 - Partials 945 957 +12 ``` | [Flag](https://app.codecov.io/gh/karmada-io/karmada/pull/5250/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/5250/flags?src=pr&el=flag&utm_medium=referral&utm_source=github&utm_content=comment&utm_campaign=pr+comments&utm_term=karmada-io) | `29.82% <ø> (+0.15%)` | :arrow_up: | 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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[mohamedawnallah]

Trying to close the PR and re-open for flaky test cases e2e test (v1.30.0) to succeed!

[mohamedawnallah]

It seems all test cases passed now :)

[zhzhuang-zju]

/assign

[zhzhuang-zju]

/lgtm cc @XiShanYongYe-Chang

[karmada-bot]

[APPROVALNOTIFIER] This PR is APPROVED

This pull-request has been approved by: XiShanYongYe-Chang

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