fix(humanitec): deduplicate updates for the same orgId/appId

[johanneswuerbach]

Motivation

People often open multiple tabs of backstage and there is no point in requesting the same information multiple times.

Approach

Keep the latest update in-memory and ensure only one update loop is running that dispatches to all open subscriptions.

[changeset-bot[bot]]

🦋 Changeset detected

Latest commit: bfed947d402e199680d616fa9b09986ee953b133

The changes in this PR will be included in the next version bump.

This PR includes changesets to release 3 packages

| Name | Type | | --------------------------------------------- | ----- | | @frontside/backstage-plugin-humanitec-backend | Patch | | @frontside/backstage-plugin-humanitec-common | Patch | | @frontside/backstage-plugin-humanitec | Patch |

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