[glab ci] Add --web option to open pipeline execution on the browser

Problem to solve

As a software engineer, I want to open the pipeline status directly on the browser, so I can see further information about the execution and interact in a easier way with the pipeline jobs.

Proposal

My proposal is to add a --web option to the glab ci view, similar to glab mr view --web.

Further details

I don't think we need further details, it's only another option for users who want to go to the browser UI to dive deeper into the pipeline execution.

Links / references

MR with my proposal: !1369 (merged).