Add Supported OS::AIX tag to AIX-bundled integrations

[pgimalac]

Summary

The Datadog Agent AIX package bundles the following Python checks. This PR adds Supported OS::AIX to their classifier_tags in manifest.json so the tile metadata accurately reflects AIX support:

• openmetrics
• ibm_mq
• ibm_ace
• ibm_db2
• ibm_i
• ibm_was
• lparstats

[dd-octo-sts]

Validation Report

All 20 validations passed.

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Validation	Description	Status
agent-reqs	Verify check versions match the Agent requirements file	✅
ci	Validate CI configuration and Codecov settings	✅
codeowners	Validate every integration has a CODEOWNERS entry	✅
config	Validate default configuration files against spec.yaml	✅
dep	Verify dependency pins are consistent and Agent-compatible	✅
http	Validate integrations use the HTTP wrapper correctly	✅
imports	Validate check imports do not use deprecated modules	✅
integration-style	Validate check code style conventions	✅
jmx-metrics	Validate JMX metrics definition files and config	✅
labeler	Validate PR labeler config matches integration directories	✅
legacy-signature	Validate no integration uses the legacy Agent check signature	✅
license-headers	Validate Python files have proper license headers	✅
licenses	Validate third-party license attribution list	✅
metadata	Validate metadata.csv metric definitions	✅
models	Validate configuration data models match spec.yaml	✅
openmetrics	Validate OpenMetrics integrations disable the metric limit	✅
package	Validate Python package metadata and naming	✅
readmes	Validate README files have required sections	✅
saved-views	Validate saved view JSON file structure and fields	✅
version	Validate version consistency between package and changelog	✅

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[chatgpt-codex-connector]

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[chatgpt-codex-connector]

Update release tooling before adding a fourth OS tag

When one of these checks is released, ddev release make updates the Agent requirements via get_agent_requirement_line, which still only knows linux, mac_os, and windows in PLATFORMS_TO_PY/ALL_PLATFORMS. Adding Supported OS::AIX to manifests that already list all three existing OSes makes the parsed platform set ['aix', 'linux', 'mac_os', 'windows'], so it no longer matches ALL_PLATFORMS and falls through to ManifestError("Can't parse the supported OS list..."); this blocks releases for the affected integrations unless the release mapping/logic is updated alongside the new classifier.

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[pgimalac]

#23608