## What this PR does
Adds a `k=kubectl` alias and bash completion for kubectl to the
e2e-testing sandbox container to maintainers have an easier time
exec'ing into the CI container when something needs to be debugged.
### Release note
```release-note
[testing] Add k=kubectl alias and enable kubectl completion in the CI
container.
```
Signed-off-by: Timofei Larkin <lllamnyp@gmail.com>
(cherry picked from commit
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| .. | ||
| images/e2e-sandbox | ||
| Chart.yaml | ||
| Makefile | ||
| values.yaml | ||