Project Access Token (bot user) is unable to trigger multi-project pipeline

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Proposal and explanation

Create two test projects, name them alpha and beta, make both of them private.

Create the following job definition in project alpha:

downstream-pipeline:
  trigger:
    include:
      - project: 'beta'
        ref: 'master'
        file: '.gitlab-ci.yml'

Create project access token (PAT) in alpha (and hence the bot user will be created). Push to alpha using this token. That triggers the pipeline in alpha, as expected. However, the pipeline will fail with the following error:

Project beta not found or access denied!

Obviously, bot user (triggerer in this case) has no access to beta. Additionally, a bot user cannot be added to any other project so the issue cannot be resolved that way.

Ideally, users should have a way to trigger pipelines like this with bot users (project access tokens).