Add processors setting for k8s data_streams

[ChrsMark]

What does this PR do?

Adds processors fields for all the Kubernetes data_streams.

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.

Related issues

• Closes Add processor optional input for the Kubernetes integration #4288

Screenshots

TBA

[gizas]

Consider put the text label processors: see https://github.com/elastic/integrations/pull/4363/files#diff-ac6d0299b88d719f78da294ca253c144259234b3e89c0a48e5f6b7e00127eaa8R21

[ChrsMark]

Here we don't need it because we just append the "processors" under the already existent list. See https://github.com/elastic/integrations/pull/4363/files/269562fce8a3910e54eac402cc7e60782c2cccaa#diff-ede93cff25650ee8746c4bd4dff62a34caf8bff51d82219bb6792a59b9111c50R10

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• Start Time: 2022-10-03T12:06:34.073+0000

• Duration: 33 min 48 sec

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Test	Results
Failed	0
Passed	90
Skipped	0
Total	90

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🌐 Coverage report

Name	Metrics % (covered/total)	Diff
Packages	100.0% (0/0)	💚
Files	100.0% (0/0)	💚 2.564
Classes	100.0% (0/0)	💚 2.564
Methods	94.872% (74/78)	👍 4.818
Lines	100.0% (0/0)	💚 8.471
Conditionals	100.0% (0/0)	💚

[ChrsMark]

Unfortunately we cannot have a commented default placeholder (b587fff) because this makes the tests (and in general Agent) to fail.
I get {"log.level":"error","@timestamp":"2022-10-03T11:45:46.802Z","log.origin":{"file.name":"fleet/fleet_gateway.go","file.line":204},"message":"failed to dispatch actions, error: fail to generate program configuration: failed to add stream processor to configuration: InjectStreamProcessorRule: processors is not a list","ecs.version":"1.6.0"} in the tests. I guess we cannot have a commented-out section as value for the processors key. I will remove the default placeholder.

[tetianakravchenko]

@ChrsMark was this version of the package promoted?

[ChrsMark]

@ChrsMark was this version of the package promoted?

elastic/package-storage#5965