glab-pipeline: add page (#7642)

pages/common/glab-pipeline.md

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+# glab pipeline
+
+> List, view, and run GitLab CI/CD pipelines.
+> More information: <https://glab.readthedocs.io/en/latest/pipeline>.
+
+- View a running pipeline on the current branch:
+
+`glab pipeline status`
+
+- View a running pipeline on a specific branch:
+
+`glab pipeline status --branch {{branch_name}}`
+
+- Get the list of pipelines:
+
+`glab pipeline list`
+
+- Run a manual pipeline on the current branch:
+
+`glab pipeline run`
+
+- Run a manual pipeline on a specific branch:
+
+`glab pipeline run --branch {{branch_name}}`