Keep failed update output parseable for JSON and CSV

[ekamran]

Summary

Fixes #161.

This fixes the output for failed plugin updates when using --format=json or --format=csv.

Before this change, the command could print structured output first and then append an error message after it. That made the JSON or CSV output hard to parse in scripts.

Changes

• Keep JSON and CSV update output parseable when an update fails.
• Still return exit code 1 for failed updates.
• Add regression tests for failed plugin update output in JSON and CSV formats.

Testing

• composer lint
• composer phpcs
• composer phpstan
• git diff --check
• composer behat features/plugin-update.feature -- --name 'Failed plugin update keeps JSON output parseable'
• composer behat features/plugin-update.feature -- --name 'Failed plugin update keeps CSV output parseable'
• composer behat features/plugin-update.feature -- --name 'Skip plugin update when plugin directory is a VCS checkout'

[github-actions]

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[codecov]

Codecov Report

✅ All modified and coverable lines are covered by tests.

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[Copilot]

Pull request overview

This PR fixes malformed machine-readable output when wp plugin update fails under --format=json or --format=csv, ensuring scripts can reliably parse the output while still signaling failure via exit code 1.

Changes:

• Exit early with status 1 for failed updates in JSON/CSV mode to prevent report_batch_operation_results() from emitting an error message after structured output.
• Add Behat regression coverage for failed plugin update output in JSON and CSV formats.

Reviewed changes

Copilot reviewed 2 out of 2 changed files in this pull request and generated no comments.

File	Description
src/WP_CLI/CommandWithUpgrade.php	Halts with exit code 1 on update failures when using JSON/CSV output to keep structured output parseable.
features/plugin-update.feature	Adds regression scenarios asserting JSON/CSV output remains parseable on failed plugin updates and exit code is 1.

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