[O11y][GCP]Migrate GCP Load Balancing TCP SSL Proxy Overview dashboard to lens

[kush-elastic]

Urgency

• High

Activity Type

• Enhancement

What does this PR do?

• Manually migrate GCP Load Balancing TCP SSL Proxy visualizations to the lens in the current Kibana version 8.7.1 itself.

• Statistics for GCP Load Balancing TCP SSL Proxy Lens migration:

Migration stats

	Before Migration			After Migration
	Lens	Vizualization	Old input controls	Lens	Vizualization	New control panels
[Metrics GCP] Load Balancing TCP SSL Proxy Overview	0	5	1	5	0	1

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 8.7.1 itself.

Related issues

• Relates [O11y][GCP Load balancing] Lens Migration #7256

Screenshots

Before Migration

After migration

[elasticmachine]

💚 Build Succeeded

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Build stats

• Start Time: 2023-08-29T06:30:53.142+0000

• Duration: 19 min 12 sec

Test stats 🧪

Test	Results
Failed	0
Passed	68
Skipped	0
Total	68

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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	87.826% (101/115)	👍
Lines	96.0% (1464/1525)	👍
Conditionals	100.0% (0/0)	💚

[rajvi-patel-22]

Looks good to me!

[elasticmachine]

Package gcp - 2.28.2 containing this change is available at https://epr.elastic.co/search?package=gcp