[8.3](backport #864) Add control-plane toleration to Agent K8S manifests.

[mergify]

This is an automatic backport of pull request #864 done by Mergify.
Cherry-pick of 689aee3 has failed:

On branch mergify/bp/8.3/pr-864
Your branch is up to date with 'origin/8.3'.

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	both modified:   deploy/kubernetes/elastic-agent-managed-kubernetes.yaml
	both modified:   deploy/kubernetes/elastic-agent-managed/elastic-agent-managed-daemonset.yaml
	both modified:   deploy/kubernetes/elastic-agent-standalone-kubernetes.yaml
	both modified:   deploy/kubernetes/elastic-agent-standalone/elastic-agent-standalone-daemonset.yaml

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[elasticmachine]

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• Start Time: 2022-08-17T13:48:09.899+0000

• Duration: 22 min 2 sec

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Test	Results
Failed	0
Passed	6089
Skipped	23
Total	6112

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[elasticmachine]

🌐 Coverage report

Name	Metrics % (covered/total)	Diff
Packages	97.222% (70/72)	👍
Files	68.326% (151/221)	👍
Classes	68.1% (301/442)	👍
Methods	51.722% (826/1597)	👍
Lines	38.026% (8855/23287)	👍 0.013
Conditionals	100.0% (0/0)	💚

[mergify]

This pull request has not been merged yet. Could you please review and merge it @yashtewari? 🙏

[ph]

@yashtewari I've fixed the conflicts in this automatic backport, can you approve it?

[yashtewari]

Thanks @ph! I was off sick. Approved but don't have permissions to merge here.