Add Behat scenarios for wp cli update --stable / --nightly PHP version checks

[swissspidy]

Accompanying test suite update for wp-cli/wp-cli#6362, which gates wp cli update --stable and wp cli update --nightly on the minimum PHP version specified in the build channel manifest files (wp-cli.manifest.json and wp-cli-nightly.manifest.json).

These scenarios ensure that WP-CLI Phar self-updates abort early with a descriptive error message when a user's PHP version does not meet the manifest requirement, preventing broken Phar updates during PHP version floor bumps.

Changes

Added two new Behat scenarios to features/cli.feature:

• Prevent stable update when PHP version requirement is not met: Stubs an HTTP response for wp-cli.manifest.json with "requires_php": "99.0.0" and verifies that {PHAR_PATH} cli update --stable --yes exits with status 1 and reports the requirement.
• Prevent nightly update when PHP version requirement is not met: Stubs an HTTP response for wp-cli-nightly.manifest.json with "requires_php": "99.0.0" and verifies that {PHAR_PATH} cli update --nightly --yes exits with status 1 and reports the requirement.

Summary by CodeRabbit

• Bug Fixes
  • CLI updates now stop safely when the selected stable or nightly release requires an unsupported PHP version.
  • Clear error messages are shown instead of proceeding with an incompatible update.

[coderabbitai]

No actionable comments were generated in the recent review. 🎉

ℹ️ Recent review info

⚙️ Run configuration

Configuration used: defaults

Review profile: CHILL

Plan: Pro Plus

Run ID: c92aa6bd-e8ae-4050-a917-eeca029ea38f

📥 Commits

Reviewing files that changed from the base of the PR and between 5315443 and 0da3cc6.

📒 Files selected for processing (1)

• features/cli.feature

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📝 Walkthrough

Walkthrough

Adds CLI feature scenarios verifying that stable and nightly updates fail when their manifests require an unavailable PHP version.

Changes

Update gating validation

Layer / File(s)	Summary
Stable and nightly PHP requirement scenarios features/cli.feature	Mocks stable and nightly manifests requiring PHP 99.0.0, then verifies the expected STDERR message and exit code 1 for both update commands.

Estimated code review effort: 1 (Trivial) | ~5 minutes

Suggested reviewers: brianhenryie, ernilambar, janw-me

🚥 Pre-merge checks | ✅ 5

✅ Passed checks (5 passed)

Check name	Status	Explanation
Description Check	✅ Passed	Check skipped - CodeRabbit’s high-level summary is enabled.
Title check	✅ Passed	The title clearly matches the added Behat scenarios covering PHP version checks for stable and nightly update flows.
Docstring Coverage	✅ Passed	No functions found in the changed files to evaluate docstring coverage. Skipping docstring coverage check.
Linked Issues check	✅ Passed	Check skipped because no linked issues were found for this pull request.
Out of Scope Changes check	✅ Passed	Check skipped because no linked issues were found for this pull request.

✨ Finishing Touches

🧪 Generate unit tests (beta)

• Create PR with unit tests
• Commit unit tests in branch fix/update-manifest-check

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