* add decibel-milliwatt canonical unit

* add changelog

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

Marks the checks bundled in the AIX datadog-agent package as supporting AIX:
openmetrics, ibm_mq, ibm_ace, ibm_db2, ibm_i, ibm_was, lparstats.

* Update dependency resolution

* Update dependency resolution

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Co-authored-by: dd-agent-integrations-bot[bot] <dd-agent-integrations-bot[bot]@users.noreply.github.com>

* Fix release tooling to handle Supported OS::AIX classifier tag

* Rename changelog to match PR number

* Ignore unknown OS platforms in get_agent_requirement_line

* Use explicit exclusion set for platforms not in agent requirements

* Rename PLATFORMS_NOT_IN_AGENT_REQUIREMENTS to PLATFORMS_IGNORE

* Apply PLATFORMS_IGNORE filter after all platform collection paths

* Skip agent requirements line when an integration only supports ignored OSes

- Return `None` from `get_agent_requirement_line` when all parsed platforms are in `PLATFORMS_IGNORE` (e.g. AIX-only manifests), and raise `ManifestError` only when no supported OS was declared at all.
- In `release make`, skip the requirements update when the line is `None`.
- Add tests for the AIX-mixed, AIX-only, and empty-supported-OS cases on both the `tile.classifier_tags` and `supported_os` paths.

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Co-authored-by: Juanpe Araque <juanpedro.araque@datadoghq.com>

…README that gets parsed inside the "Configuration instructions" section (#23673)

* Port in-product tile instructions for some OAuth integrations to the README that gets parsed inside the "Configuration instructions" section

* Fix URL reference index

* Apply all suggestions from code review, thank you!

Co-authored-by: DeForest Richards <56796055+drichards-87@users.noreply.github.com>

* Fix incorrect link

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Co-authored-by: DeForest Richards <56796055+drichards-87@users.noreply.github.com>