Add metric_type mapping for compute data stream

[agithomas]

• Enhancement

What does this PR do?

Add metric_type mapping for GCP compute datastream

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

Related issues

#6711

Screenshots

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• Start Time: 2023-07-04T04:44:27.749+0000

• Duration: 18 min 2 sec

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Test	Results
Failed	0
Passed	59
Skipped	0
Total	59

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🌐 Coverage report

Name	Metrics % (covered/total)	Diff
Packages	100.0% (6/6)	💚
Files	100.0% (6/6)	💚 2.909
Classes	100.0% (6/6)	💚 2.909
Methods	89.623% (95/106)	👎 -2.525
Lines	96.0% (1464/1525)	👍 4.142
Conditionals	100.0% (0/0)	💚

[botelastic]

Hi! We just realized that we haven't looked into this PR in a while. We're sorry! We're labeling this issue as Stale to make it hit our filters and make sure we get back to it as soon as possible. In the meantime, it'd be extremely helpful if you could take a look at it as well and confirm its relevance. A simple comment with a nice emoji will be enough :+1. Thank you for your contribution!

[botelastic]

Hi! This PR has been stale for a while and we're going to close it as part of our cleanup procedure. We appreciate your contribution and would like to apologize if we have not been able to review it, due to the current heavy load of the team. Feel free to re-open this PR if you think it should stay open and is worth rebasing. Thank you for your contribution!