[GCP] Remove broken input control reference panel and replace with new-style control

[tommyers-elastic]

What does this PR do?

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After:

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

• Install the dashboard locally to validate the new controls.

How to test this PR locally

cd packages/gcp
elastic-package build .
elastic-package stack up -d --services=package-registry
...

Related issues

• Closes Dashboard [Metrics GCP] Compute Overview - missing visualization #5006

[elasticmachine]

💚 Build Succeeded

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Build stats

• Start Time: 2023-01-19T14:21:39.782+0000

• Duration: 19 min 51 sec

Test stats 🧪

Test	Results
Failed	0
Passed	53
Skipped	0
Total	53

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[elasticmachine]

🌐 Coverage report

Name	Metrics % (covered/total)	Diff
Packages	100.0% (6/6)	💚
Files	100.0% (6/6)	💚
Classes	100.0% (6/6)	💚
Methods	90.291% (93/103)	👍 29.532
Lines	95.976% (1455/1516)	👎 -2.817
Conditionals	100.0% (0/0)	💚

[elasticmachine]

Package gcp - 2.16.1 containing this change is available at https://epr.elastic.co/search?package=gcp