[O11y][NATS] Migrate Metrics Overview dashboard visualizations to lens

[rajvi-patel-22]

Urgency

• High

Activity Type

• Enhancement

What does this PR do?

• Manually migrate Nats visualizations to the lens in the current Kibana version 8.10.2 itself.

• Statistics for Nats Lens migration:

Migration stats

	Before Migration		After Migration
	Lens	Vizualization	Lens	Vizualization
[Metrics NATS] Overview	0	15	15	0

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 8.10.2 itself.

Related issues

• Relates [O11y][Nats] Nats Lens migration #7777

Before Migration:

After Migration:

[elasticmachine]

💚 Build Succeeded

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Build stats

• Start Time: 2023-10-10T08:47:13.382+0000

• Duration: 30 min 0 sec

Test stats 🧪

Test	Results
Failed	0
Passed	31
Skipped	2
Total	33

🤖 GitHub comments

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[elasticmachine]

🌐 Coverage report

Name	Metrics % (covered/total)	Diff
Packages	100.0% (1/1)	💚
Files	100.0% (1/1)	💚 5.556
Classes	100.0% (1/1)	💚 5.556
Methods	100.0% (29/29)	💚 13.953
Lines	95.522% (192/201)	👍 9.439
Conditionals	100.0% (0/0)	💚

[milan-elastic]

LGTM!

[elasticmachine]

Package nats - 1.3.4 containing this change is available at https://epr.elastic.co/search?package=nats