Azure DevOps CI pipeline example improvements

[MilanKovacic]

Documentation issue

• Reporting a typo
• Reporting a documentation bug
• Documentation improvement
• Documentation feedback

Is there a specific documentation page you are reporting?

https://nx.dev/ci/recipes/set-up/monorepo-ci-azure

Additional context or description

1. PR trigger is not universally supported in ADO pipelines: https://learn.microsoft.com/en-us/azure/devops/pipelines/yaml-schema/pr?view=azure-pipelines#remarks. This documentation page should probably be linked in a comment.

2. Branch name used for the az pipelines CLI (LAST_SHA=$(az pipelines build list --branch $(Build.SourceBranchName)...) is incorrect. ADO incorrectly assumes that the branch name is everything after last "/", which gives wrong results in case prefixes like fix/example are used. See Build.SourceBranchName does not include full name, if name includes forward slash microsoft/azure-pipelines-agent#838 (comment) for an example of a workaround.

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