[Metricbeat] [IIS] Fetch all Application Pools, including non-running ones

[lucian-ioan]

Proposed commit message

This PR enhances the application pool fetching logic to include both running and non-running application pools in the metrics collection process.

Previously, the code only retrieved metrics for running application pools.

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• My code follows the style guidelines of this project
• I have commented my code, particularly in hard-to-understand areas
• I have made corresponding changes to the documentation
• I have made corresponding change to the default configuration files
• I have added tests that prove my fix is effective or that my feature works
• I have added an entry in CHANGELOG.next.asciidoc or CHANGELOG-developer.next.asciidoc.

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[mergify]

This pull request does not have a backport label.
If this is a bug or security fix, could you label this PR @lucian-ioan? 🙏.
For such, you'll need to label your PR with:

• The upcoming major version of the Elastic Stack
• The upcoming minor version of the Elastic Stack (if you're not pushing a breaking change)

To fixup this pull request, you need to add the backport labels for the needed
branches, such as:

• backport-v8./d.0 is the label to automatically backport to the 8./d branch. /d is the digit

[elasticmachine]

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• Start Time: 2024-05-08T20:05:04.422+0000

• Duration: 25 min 50 sec

Test stats 🧪

Test	Results
Failed	0
Passed	531
Skipped	32
Total	563

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