IIS - Update ingest pipeline to process event.duration

[muthu-mps]

• Bug

What does this PR do?

This PR updates the field name in the ingest pipeline processor. Which will ingest the event.duration field to Elasticsearch.

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.

How to test this PR locally

Run pipeline tests
Verify the event.duration field is captured in the Expected json file.
Run the integration and verify the data is getting ingested into Elasticsearch.

Related issues

• Closes IIS event.duration(time_taken) is ignored in ingest pipeline #4475

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Build stats

• Start Time: 2022-10-20T10:27:32.960+0000

• Duration: 13 min 4 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)	💚 2.508
Classes	100.0% (2/2)	💚 2.508
Methods	85.714% (30/35)	👎 -4.598
Lines	93.772% (271/289)	👍 1.421
Conditionals	100.0% (0/0)	💚

[ManojS-shetty]

LGTM!