add karmada.io/system label to created execution namespaces

[grosser]

/kind feature

What this PR does / why we need it:

followup to https://github.com/karmada-io/karmada/pull/4620 where this was not added

Special notes for your reviewer:

Does this PR introduce a user-facing change?:

- add karmada.io/system=true label to newly created karmada-es-* namespaces

[codecov-commenter]

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Codecov Report

Attention: Patch coverage is 0% with 6 lines in your changes missing coverage. Please review.

Project coverage is 28.26%. Comparing base (721495d) to head (13f0f6e). Report is 12 commits behind head on master.

Files	Patch %	Lines
pkg/controllers/cluster/cluster_controller.go	0.00%	3 Missing :warning:
pkg/karmadactl/util/idempotency.go	0.00%	3 Missing :warning:

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Additional details and impacted files

```diff @@ Coverage Diff @@ ## master #5243 +/- ## ======================================= Coverage 28.26% 28.26% ======================================= Files 632 632 Lines 43732 43738 +6 ======================================= + Hits 12359 12362 +3 - Misses 30472 30475 +3 Partials 901 901 ``` | [Flag](https://app.codecov.io/gh/karmada-io/karmada/pull/5243/flags?src=pr&el=flags&utm_medium=referral&utm_source=github&utm_content=comment&utm_campaign=pr+comments&utm_term=karmada-io) | Coverage Δ | | |---|---|---| | [unittests](https://app.codecov.io/gh/karmada-io/karmada/pull/5243/flags?src=pr&el=flag&utm_medium=referral&utm_source=github&utm_content=comment&utm_campaign=pr+comments&utm_term=karmada-io) | `28.26% <0.00%> (+<0.01%)` | :arrow_up: | Flags with carried forward coverage won't be shown. [Click here](https://docs.codecov.io/docs/carryforward-flags?utm_medium=referral&utm_source=github&utm_content=comment&utm_campaign=pr+comments&utm_term=karmada-io#carryforward-flags-in-the-pull-request-comment) to find out more.

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[grosser]

updated to make every callsite of CreateOrUpdateNamespace set the labels, not sure what other changed we'd need

[XiShanYongYe-Chang]

Hi @grosser, the CI-lint is failed. Can you help fix it?

[grosser]

• there should be a make lint to run locally that fixes things
• the hack/ script does not work

  
  golangci/golangci-lint info installed /Users/mgrosser/go/bin/golangci-lint
  hack/verify-staticcheck.sh: line 36: golangci-lint: command not found

Please review the above warnings.

... I can make a PR for that

[grosser]

lint is happy now

[XiShanYongYe-Chang]

/cc @chaunceyjiang

[XiShanYongYe-Chang]

Thanks /approve

[karmada-bot]

[APPROVALNOTIFIER] This PR is APPROVED

This pull-request has been approved by: XiShanYongYe-Chang

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Needs approval from an approver in each of these files: - ~~[pkg/controllers/OWNERS](https://github.com/karmada-io/karmada/blob/master/pkg/controllers/OWNERS)~~ [XiShanYongYe-Chang] - ~~[pkg/karmadactl/OWNERS](https://github.com/karmada-io/karmada/blob/master/pkg/karmadactl/OWNERS)~~ [XiShanYongYe-Chang] Approvers can indicate their approval by writing `/approve` in a comment Approvers can cancel approval by writing `/approve cancel` in a comment