[CockroachDB] Revert metrics field definition to the format used befo…

[ritalwar]

• Enhancement

What does this PR do?

Revert cockroachDB metrics field definition to the format used before introducing metric_type.
This is done because of this issue.
Although, CockroachDB remained unaffected by this issue. However, with the fix now accessible and the necessary changes present in the elastic-package, it's good to revert to the original format.

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 Adding metric_type mapping for CockroachDB TSDB Enablement. #6728

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• Start Time: 2023-08-17T07:07:46.902+0000

• Duration: 15 min 9 sec

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Name	Metrics % (covered/total)	Diff
Packages	100.0% (0/0)	💚
Files	100.0% (0/0)	💚 3.401
Classes	100.0% (0/0)	💚 3.401
Methods	75.0% (3/4)	👎 -16.793
Lines	100.0% (0/0)	💚 11.666
Conditionals	100.0% (0/0)	💚

[agithomas]

Why the reverting is done? Can you link to the related issue?

[ritalwar]

Why the reverting is done? Can you link to the related issue?

This is the issue.
CockroachDB remained unaffected by this issue. However, with the fix now accessible and the necessary changes present in the elastic-package, it's good to revert to the original format.

[agithomas]

LGTM!

[elasticmachine]

Package cockroachdb - 1.5.1 containing this change is available at https://epr.elastic.co/search?package=cockroachdb