[Kubernetes] Enable tsdb by default

[tetianakravchenko]

What does this PR do?

This PR enables TSDB for Kubernetes package by default.
Note:

elasticsearch:
  index_mode: "time_series"

is not set only for 1 data_stream: events. There will be created a dedicated github issue fix event data_stream and enable TSDB.

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

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• Start Time: 2023-05-15T14:16:36.508+0000

• Duration: 30 min 1 sec

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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)	👍 0.916
Lines	100.0% (0/0)	💚 12.766
Conditionals	100.0% (0/0)	💚

[lalit-satapathy]

Approving - similar to #6129

Assuming all data streams here work fine with TSDB enabled.

[elasticmachine]

Package kubernetes - 1.40.0-beta containing this change is available at https://epr.elastic.co/search?package=kubernetes