Cannot create CI/CD process for re-publishing Mesh

I'm trying to create CI/CD process for Mesh. So goal is to have Gitlab pipeline which triggers mesh update everytime mesh being updated in git repository.

By following documentation I can create CI/CD for deploying App Builder application and it works fine, but I cannot do the same for mesh.

### Expected Behaviour

After I configured by Secrets,

`aio api-mesh update mesh.json`

Have to update mesh without using browser login again and again. Same as command

`aio app deploy`

So just to be clear, exactly same project, execute deploy command without asking for browser login, but mesh publish do - which makes impossible to implement CI/CD pipelines.

### Actual Behaviour

`aio api-mesh update mesh.json` asking to login if run inside pipeline even if `aio app deploy` not

#### Steps to Reproduce

1. Create New App Builder application
2. deploy application with `aio app deploy`
3. Application successfully deployed.
4. Run any `aio api-mesh create mesh.json` command
5. You will be forced to login via browser.

#### Logs taken while reproducing problem

Some notes: I see that mesh plugin has own auth helpers:

@adobe/aio-cli/node_modules/@adobe/aio-cli-plugin-api-mesh/src/helpers.js

which maybe working in different manner then default auth mechanism.

Inizia da @adobe/aio-cli/node_modules/@adobe/aio-cli-plugin-api-mesh/src/helpers.js e confronta il relativo percorso di autenticazione con quello usato da aio app deploy. Riproduci aio api-mesh create mesh.json e aio api-mesh update mesh.json nel contesto della GitLab pipeline descritto. Il lavoro è completato quando i comandi mesh usano i secrets configurati senza richiedere un ulteriore accesso tramite browser, con coverage per il caso della pipeline.

Scritto dal modello di indicizzazione a partire dal testo della issue.