[GCP] Move dashboard visualizations to by value

[endorama]

What does this PR do?

As per #3448 (and it's GCP dedicated issue #3719) we want to migrate Dashboards to use by value visualization instead of by reference.

This PR does it for GCP dashboard available in GCP package as of today.

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

• Closes [GCP] Migrate package dashboards to by value visualization #3719

Screenshots

[endorama]

Changelog missing, will update once this is ready to be merged

[elasticmachine]

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• Start Time: 2022-10-06T13:46:36.623+0000

• Duration: 20 min 15 sec

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Total	52

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[elasticmachine]

🌐 Coverage report

Name	Metrics % (covered/total)	Diff
Packages	100.0% (5/5)	💚
Files	100.0% (5/5)	💚 2.513
Classes	100.0% (5/5)	💚 2.513
Methods	90.099% (91/101)	👎 -0.208
Lines	95.752% (1375/1436)	👍 4.113
Conditionals	100.0% (0/0)	💚

[kaiyan-sheng]

Besides changelog, I think we are missing the kibana version change in manifest.yml

[mbondyra]

I haven't checked all the dashboards yet, but would it be possible to convert the legacy visualizations to Lens when it's possible? For example, for [Logs GCP] Audit dashboard all the selected visualizations are using Visualize and they could be already using Lens.

[efd6]

I've checked the dashboards briefly (all appear to be OK, but I have only checked that audit, firewall and vpc flow render events correctly).

[mbondyra]

Approved as probably moving to lens will be a part of a different PR 👌🏼

[endorama]

Added changelog and remove compatibility with kibana 7.x, as suggested.

[elasticmachine]

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[endorama]

Thanks all!