Extend user agent of publishing workflow

[tolzhabayev]

Why?

We are currently setting a generic user agent here:

plugin-ci-workflows/actions/plugins/publish/publish/publish.sh

Line 81 in 4232781

"-H" "User-Agent: github-actions-shared-workflows:/plugins/publish"

This could be extended to give us more visibility into who is actually calling the API as in - which repository or plugin it actually is.

Here is what it looks like in the gcom logs https://ops.grafana-ops.net/goto/df600zl8suu4gd?orgId=stacks-27821

  "userAgent": "github-actions-shared-workflows:/plugins/publish",

What / How

(whatever is simpler and more stable):
Change it either to:

  "userAgent": "github-actions-shared-workflows:grafana/<repo-name>/plugins/publish",

or (we seem to have plugin.id in the same script)

  "userAgent": "github-actions-shared-workflows:/<pluginId>/plugins/publish",