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Fix bad column alignment when using custom columns from OpenAPI schema
Columns printed by `kubectl get` weren't aligned properly when they were coming from the OpenAPI schema.
This was caused by `CustomColumnPrinter.PrintObj`, which was creating a new `tabwriter.Writer` instead of re-using the tabwriter received through the `out` method parameter (basically, a tabwriter was writing to another tabwriter). Because the PrintObj flushed the tabwriter after writing each individual line, the column widths would reset.
**What this PR does / why we need it**:
This PR fixes the bad column alignment.
**Which issue(s) this PR fixes**
Fixes#56282
**Special notes for your reviewer**:
I've aligned how `CustomColumnPrinter.PrintObj` handles tabwriter with how `HumanReadablePrinter.PrintObj` does it (see https://github.com/kubernetes/kubernetes/blob/master/pkg/printers/humanreadable.go#L299-L303)
**Release note**:
```release-note
Fixed column alignment when kubectl get is used with custom columns from OpenAPI schema
```
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