[NGINX] After 8.6.0, kubernetes pod labels used for condition matching are not dedoted

[MichaelKatsoulis]

What does this PR do?

After 8.6.0, kubernetes pod labels used for condition matching are not dedoted.
PR that introduced this is elastic/elastic-agent#1398

So the nginx_ingress_controller integration needs to be updated with the correct defaults for conditions used to match the ingress-nginx pod.

Checklist

• I have reviewed tips for building integrations and this pull request is aligned with them.
• I have verified that all data streams collect metrics or logs.
• I have added an entry to my package's changelog.yml file.
• I have verified that Kibana version constraints are current according to guidelines.

Author's Checklist

• [ ]

How to test this PR locally

1. Set up an elastic-stack of 8.6.0 version
2. Set up kubernetes cluster and ingress-nginx following https://kind.sigs.k8s.io/docs/user/ingress/
3. Install 1.7.0 versions of nginx_ingress_controller package
4. Run agent with the correct policy
5. Check logs being collected

[elasticmachine]

💚 Build Succeeded

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• Start Time: 2023-01-25T10:02:31.793+0000

• Duration: 13 min 30 sec

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Failed	0
Passed	28
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Total	28

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[elasticmachine]

🌐 Coverage report

Name	Metrics % (covered/total)	Diff
Packages	100.0% (2/2)	💚
Files	100.0% (2/2)	💚
Classes	100.0% (2/2)	💚
Methods	92.0% (23/25)	👎 -3.868
Lines	94.428% (322/341)	👎 -1.339
Conditionals	100.0% (0/0)	💚

[ChrsMark]

Change looks good to me. Do you also plan to enhance the provider's docs regarding the dedoting concept?

[MichaelKatsoulis]

Change looks good to me. Do you also plan to enhance the provider's docs regarding the dedoting concept?

Yes until now there is no documentation pointing that for autodiscover templates , dedoting was needed for labels.
This information is blur and needs to be clear.

[elasticmachine]

Package nginx_ingress_controller - 1.7.0 containing this change is available at https://epr.elastic.co/search?package=nginx_ingress_controller