[GCP] Convert some dashboards to lens

[P1llus]

What does this PR do?

Converts the Audit, VPCFlow and Firewall related dashboards to lens, format or layout did not change. The audit dashboard had a duplicate dashboard, removed one of them.
Also removed the tags that should not be exported, must have been from an earlier mistake.

Most visualizations was already lens, removed some markdown using TVSB, and changing up the filters on the rest.

Bumped format_version to 2.7.0 and fixes event.type/category for firewall/audit/vpcflow.

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.

[elasticmachine]

Pinging @elastic/security-external-integrations (Team:Security-External Integrations)

[elasticmachine]

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Build stats

• Start Time: 2023-07-19T18:59:04.578+0000

• Duration: 19 min 12 sec

Test stats 🧪

Test	Results
Failed	0
Passed	58
Skipped	0
Total	58

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[kcreddy]

LGTM 👍🏼

CI looks to be complaining about array type on following fields. Probably need to change to flattened
https://github.com/P1llus/integrations/blob/package_gcp_lens/packages/gcp/data_stream/audit/fields/fields.yml#L21
https://github.com/P1llus/integrations/blob/package_gcp_lens/packages/gcp/data_stream/audit/fields/fields.yml#L100
https://github.com/P1llus/integrations/blob/package_gcp_lens/packages/gcp/data_stream/firewall/fields/fields.yml#L34

[P1llus]

LGTM 👍🏼

CI looks to be complaining about array type on following fields. Probably need to change to flattened https://github.com/P1llus/integrations/blob/package_gcp_lens/packages/gcp/data_stream/audit/fields/fields.yml#L21 https://github.com/P1llus/integrations/blob/package_gcp_lens/packages/gcp/data_stream/audit/fields/fields.yml#L100 https://github.com/P1llus/integrations/blob/package_gcp_lens/packages/gcp/data_stream/firewall/fields/fields.yml#L34

Thanks!
Yeah almost, the sub-fields are defined, so nested is better than flattened in this case, the type "array" does not exist, even though I have seen it been defined that way in multiple places.

[elasticmachine]

🌐 Coverage report

Name	Metrics % (covered/total)	Diff
Packages	100.0% (6/6)	💚
Files	100.0% (6/6)	💚 10.526
Classes	100.0% (6/6)	💚 10.526
Methods	89.623% (95/106)	👍 4.859
Lines	96.0% (1464/1525)	👍 10.331
Conditionals	100.0% (0/0)	💚

[elasticmachine]

Package gcp - 2.23.0 containing this change is available at https://epr.elastic.co/search?package=gcp