[anthropic_metrics] change palette and lens type

[jakubgalecki0]

Proposed commit message

Convert the “Total Token Usage by Workspace” and “Cache Efficiency Ratio” panels from lnsXY to lnsPie, and update dashboard visualizations to use the default color palette.

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.
• I have verified that any added dashboard complies with Kibana's Dashboard good practices

Author's Checklist

• [ ]

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before

after

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[ishleenk17]

@jakubgalecki0 : Please add the before and after screenshots.

[ishleenk17]

@jakubgalecki0 : Also lets take the screenshots of the new dashboards. And we can make it with dark mode.
Thats the recommendation we got from Dashboard team

[github-actions]

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