[Kubernetes] Remove container.name as dimension field

[constanca-m]

What does this PR do?

Removes the change introduced by #6108.

container.id field is available and already set as dimension. Both the name and id are unique, so only one of them is necessary.

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.

[elasticmachine]

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• Start Time: 2023-05-15T13:02:32.214+0000

• Duration: 29 min 53 sec

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Test	Results
Failed	0
Passed	92
Skipped	0
Total	92

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Name	Metrics % (covered/total)	Diff
Packages	100.0% (0/0)	💚
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Classes	100.0% (0/0)	💚
Methods	96.154% (75/78)	👍 24.095
Lines	100.0% (0/0)	💚
Conditionals	100.0% (0/0)	💚

[elasticmachine]

Package kubernetes - 1.39.0 containing this change is available at https://epr.elastic.co/search?package=kubernetes