support update object annotations

[mrlihanbo]

Signed-off-by: lihanbo lihanbo2@huawei.com

What type of PR is this?
/kind cleanup

What this PR does / why we need it:
For annotations set by controllers in a member cluster we won't overwrite them. But for annotations set by user in resource template, we should support to update them. Before this commit, annotations can't update if resource has been propagated which is unreasonable.

Which issue(s) this PR fixes:
Fixes #794 #650

Special notes for your reviewer:

Does this PR introduce a user-facing change?:

karmada-controller-manager: fixed the annotation of resource template can not be updated issue.

[XiShanYongYe-Chang]

This pr fix the issue #650

@pigletfly

[XiShanYongYe-Chang]

/lgtm

[RainbowMango]

/approve

[karmada-bot]

[APPROVALNOTIFIER] This PR is APPROVED

This pull-request has been approved by: RainbowMango

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[RainbowMango]

/kind remove cleanup
/kind bug

[karmada-bot]

@RainbowMango: The label(s) kind/remove cannot be applied, because the repository doesn't have them.

In response to this:

/kind remove cleanup
/kind bug

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[RainbowMango]

/remove-kind cleanup