Include Azure in `env_ci` categorisation

[shauns]

WHY are these changes introduced?

Adds support for detecting Azure CI environments in the CLI toolkit's continuous integration platform detection system.

WHAT is this pull request doing?

Adds Azure CI platform detection by checking for the presence of the TF_BUILD environment variable. When detected, the system will now correctly identify and return Azure-specific CI platform information.

How to test your changes?

1. Set the TF_BUILD environment variable to "true"
2. Run the CI platform detection code
3. Verify that the system correctly identifies the environment as Azure CI
4. Verify that the returned object contains:
   • isCI: true
   • name: 'azure'
   • appropriate metadata

Measuring impact

• [x] n/a - this doesn't need measurement, e.g. a linting rule or a bug-fix

Checklist

• [x] I've considered possible cross-platform impacts (Mac, Linux, Windows)
• [x] I've considered possible documentation changes

[shauns]

• #4814 👈
• main

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[github-actions[bot]]

Coverage report

St.:grey_question:	Category	Percentage	Covered / Total
🟡	Statements	72.06% (+0.02% 🔼)	8356/11596
🟡	Branches	68.51% (+0.04% 🔼)	4042/5900
🟡	Functions	71.33%	2192/3073
🟡	Lines	72.44% (+0.02% 🔼)	7902/10908

Test suite run success

1893 tests passing in 867 suites.

Report generated by 🧪jest coverage report action from d95e1b3b76ca4b4c2d9b9a42aacc403ee3f2e27f

[github-actions[bot]]

We detected some changes at packages/*/src and there are no updates in the .changeset. If the changes are user-facing, run "pnpm changeset add" to track your changes and include them in the next release CHANGELOG.

[shauns]

Merge activity

• Nov 8, 5:06 AM EST: A user started a stack merge that includes this pull request via Graphite.
• Nov 8, 5:06 AM EST: A user merged this pull request with Graphite.