[IIS] Accept multiple application_pool name

[muthu-mps]

• Bug

What does this PR do?

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.

How to test this PR locally

Create multiple application pools in IIS Manager
Verify all the application pool metrics are getting captured.
Specify names in the application pool configuration and verify whether only those metrics are being captured.

Related issues

• Closes IIS - Multiple application pool names metrics are not getting processed #4445

Screenshots

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• Start Time: 2023-01-30T07:20:42.152+0000

• Duration: 13 min 10 sec

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Passed	29
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Total	29

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Name	Metrics % (covered/total)	Diff
Packages	100.0% (2/2)	💚
Files	100.0% (2/2)	💚
Classes	100.0% (2/2)	💚
Methods	85.714% (30/35)	👎 -2.475
Lines	93.772% (271/289)	👎 -3.887
Conditionals	100.0% (0/0)	💚

[ishleenk17]

Changes look fine. Do we have some test data for this? and sample event generated for the same.

[muthu-mps]

Each application pool comes as a separate document. This change will get reflected in Kibana. I am adding the screenshot here for reference.

[ishleenk17]

Looks good!

[elasticmachine]

Package iis - 1.4.1 containing this change is available at https://epr.elastic.co/search?package=iis