Add group field to iis packages

[teresaromero]

Proposed commit message

Add group: iis to the manifest of all iis-related packages: iis, iis_otel, iis_input_otel.

WHAT: Adds a group field to each package's manifest.yml, immediately after the type field, with the value iis. Each package receives a patch version bump and a corresponding changelog entry.

WHY: The Kibana UI uses the group field to display related packages as a unified technology tile, allowing users to discover and install the full iis observability stack from a single entry point.

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.
• I have verified that any added dashboard complies with Kibana's Dashboard good practices

Author's Checklist

• Verify group: iis appears in all 3 package manifests.
• Verify the Kibana UI renders the iis technology tile correctly grouping all packages.

How to test this PR locally

Start a local registry (v1.40.0) pointing at this branch using elastic-package v0.126.0 and query each package:

elastic-package stack up

Requires elastic-package v0.126.0, which starts the registry at v1.40.0.

GET https://localhost:8080/search?package=iis
GET https://localhost:8080/search?package=iis_otel
GET https://localhost:8080/search?package=iis_input_otel

Each response should contain "group": "iis". Example:

GET https://localhost:8080/search?package=iis

{
  "name": "iis",
  "version": "1.24.9",
  "type": "integration",
  "group": "iis"
}

Related issues

• Relates https://github.com/elastic/ingest-dev/issues/8085

Screenshots

[github-actions]

✅ Elastic Docs Style Checker (Vale)

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[elastic-vault-github-plugin-prod]

✅ All changelog entries have the correct PR link.

[elastic-vault-github-plugin-prod]

🚀 Benchmarks report

Package iis 👍(1) 💚(0) 💔(1)

Expand to view

Data stream	Previous EPS	New EPS	Diff (%)	Result
error	3831.42	3184.71	-646.71 (-16.88%)	💔

To see the full report comment with /test benchmark fullreport

[infra-vault-gh-plugin-prod]

💚 Build Succeeded

• Buildkite Build
• Commit: f89271f

History

• 💚 Build #47262 succeeded 521de28
• 💔 Build #47254 failed 0218740

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[elastic-vault-github-plugin-prod]

Package iis - 1.24.9 containing this change is available at https://epr.elastic.co/package/iis/1.24.9/

[elastic-vault-github-plugin-prod]

Package iis_otel - 0.5.2 containing this change is available at https://epr.elastic.co/package/iis_otel/0.5.2/

[elastic-vault-github-plugin-prod]

Package iis_otel_input - 0.1.2 containing this change is available at https://epr.elastic.co/package/iis_otel_input/0.1.2/