[IIS] Add dimension field mapping for application_pool datastream to …

[ritalwar]

• Enhancement

What does this PR do?

This PR adds dimension fields mapping for the application_pool data stream of IIS to support TSDB enablement.

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.

Related issues

• Relates [IIS] TSDB Enablement #6267

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• Start Time: 2023-06-05T11:37:00.367+0000

• Duration: 14 min 18 sec

Test stats 🧪

Test	Results
Failed	0
Passed	29
Skipped	0
Total	29

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🌐 Coverage report

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)	👎 -14.286
Lines	93.772% (271/289)	👎 -1.572
Conditionals	100.0% (0/0)	💚

[agithomas]

LGTM!

[elasticmachine]

Package iis - 1.12.0 containing this change is available at https://epr.elastic.co/search?package=iis