add manual pipeline

• Related issues: #739 (task 2)
• Requested reviewers: @kiene, @pajunen

Reason why this change is needed

• Add manual triggered pipeline for stereo and multichannel.
• To trigger the manual pipeline go to Pipelines > Run pipeline > select ci/be-test-against-accepted-release-ci-job, select test-be-release for pipeline type> enter ref and cut commit id or release tag > Run pipeline

Description of the change

• Describe what is done.

Affected operating points

• Describe here as well as possible what operating points are affected and how
• In minimum, there should be a status for bitstream compatibility and output bit exactness
• For bitstream compatibility, the following levels are helpful for describing encoder
  1. Produced bitstream is BE compared to previous state.
  2. Produced bitstream is non-BE but it is fully backwards compatible for decoding. Decoded output may differ.
  3. Produced bitstream is non-BC. Old decoder cannot decode the produced bitstream correctly.
• For output difference, use BE or non-BE. Additionally, amount of difference can be presented.