[O11Y] [GCP Billing] Update Legacy metrics in GCP Billing overview dashboard

[milan-elastic]

What does this PR do?

Update Legacy metric visualization to new metric in GCP Billing overview dashboard.

Checklist

• I have added an entry to my package's changelog.yml file.
• I have verified that panels are populated with data.
• I have verified that panels are not distorted after being migrated to the lens.
• I have updated screenshots of the dashboard.
• I have verified that the data counts are matching and panel aggregations are the same as before.

Author's Checklist

• Migrated panels should be removed from visualization folder.
• Migrated visualizations are populating in current Kibana version 8.10.1 itself.

How to test this PR locally

Related issues

• Relates [GCP Billing] Update Legacy metrics in GCP Billing overview dashboard #7252

Screenshots

Before migration

After migration

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Build stats

• Start Time: 2023-11-24T10:04:27.656+0000

• Duration: 21 min 59 sec

Test stats 🧪

Test	Results
Failed	0
Passed	69
Skipped	0
Total	69

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🌐 Coverage report

Name	Metrics % (covered/total)	Diff
Packages	100.0% (6/6)	💚
Files	100.0% (6/6)	💚
Classes	100.0% (6/6)	💚
Methods	87.826% (101/115)	❕
Lines	95.124% (1502/1579)	❕
Conditionals	100.0% (0/0)	💚

[lalit-satapathy]

Adding @gpop63 for review.

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🚀 Benchmarks report

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[ishleenk17]

Looks good!

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Package gcp - 2.33.1 containing this change is available at https://epr.elastic.co/search?package=gcp