fix: return result of parent alerts add [LIBS-695]

[KaiVandivier]

Part of LIBS-695

Returns result of parentAlertsAdd (an alert) for useAlert() in the plugin context to receive

See also https://github.com/dhis2/app-runtime/pull/1388 -- it would probably make sense to merge that one first, then update the app-runtime dep in platform 👍

• [x] Update app-runtime dep here
• [x] Catch up with alpha

[dhis2-bot]

:tada: This PR is included in version 12.0.0-alpha.18 :tada:

The release is available on:

• npm package (@alpha dist-tag)
• npm package (@alpha dist-tag)
• npm package (@alpha dist-tag)
• npm package (@alpha dist-tag)
• GitHub release

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