Operator e2e init

[liangyuanpeng]

What type of PR is this?
/kind cleanup
What this PR does / why we need it:

Init operator e2e test.

Which issue(s) this PR fixes:

Related:

• Add E2E tests to cover karmada operator functionality #3745

Special notes for your reviewer:

Does this PR introduce a user-facing change?:

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[liangyuanpeng]

I was hoping to get some advice to confirm that i have on the right side:

• Create a separate github workflow to run operator e2e test,
• Keep the e2e test at test/e2e_operator and not test/e2e, Test decoupling from karmada and facilitate subsequent independent operator projects

/cc @RainbowMango @calvin0327

[RainbowMango]

Create a separate github workflow to run operator e2e test,

Just a question, why do you think we need another workflow for karmada-operator?