chore: add namespace override for multi-namespace deployments

[chinaran]

What type of PR is this?

/kind deployment

What this PR does / why we need it:

Add namespace override for multi-namespace deployments in combined charts.

[hami-robott]

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

In response to this:

What type of PR is this?

/kind deployment

What this PR does / why we need it:

Add namespace override for multi-namespace deployments in combined charts.

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[hami-robott]

[APPROVALNOTIFIER] This PR is NOT APPROVED

This pull-request has been approved by: chinaran
Once this PR has been reviewed and has the lgtm label, please assign archlitchi for approval. For more information see the Kubernetes Code Review Process.

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[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Flag	Coverage Δ
unittests	64.41% <ø> (+17.42%)	⬆️

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see 11 files with indirect coverage changes

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[chinaran]

@archlitchi @wawa0210 Please check out.