[Istio] Enable TSDB by default

[constanca-m]

What does this PR do?

Enable TSDB by default for all metrics 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

Relates to #6567.

[elasticmachine]

💚 Build Succeeded

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Build stats

• Start Time: 2023-07-20T09:08:36.827+0000

• Duration: 17 min 42 sec

Test stats 🧪

Test	Results
Failed	0
Passed	14
Skipped	0
Total	14

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[elasticmachine]

🌐 Coverage report

Name	Metrics % (covered/total)	Diff
Packages	100.0% (1/1)	💚
Files	100.0% (3/3)	💚 2.767
Classes	100.0% (3/3)	💚 2.767
Methods	90.0% (27/30)	👎 -2.172
Lines	97.472% (347/356)	👍 6.322
Conditionals	100.0% (0/0)	💚

[lalit-satapathy]

LGTM. Awaiting code owner approval.

[gsantoro]

I haven't tested how it works since I am not familiar with TSDB. Code changes look good as far as I know

[elasticmachine]

Package istio - 0.4.0 containing this change is available at https://epr.elastic.co/search?package=istio