Repair wp/7.0 branch Actions: Pin wp-env's WordPress Core version

[desrosj]

Part of #82782.

What?

Pins wp-env's WordPress core checkout to WordPress/WordPress#7.0-branch via .wp-env.json's "core" value, and removes the wordpress test matrix dimension, the WP_ENV_CORE environment variable override, and the compute-previous-wordpress-version job it depended on from unit-test.yml's test-php job.

Why?

.wp-env.json's "core" value was unpinned ("WordPress/WordPress"), so every PHP unit test run built its WordPress environment against whatever commit happened to be on WordPress Core's own trunk at run time. That makes test-php non-reproducible and ties this frozen branch's CI to unrelated, ongoing changes on a different project's default branch — the opposite of what a maintenance branch's CI should depend on. Pinning to Core's own 7.0-branch tests against the WordPress version this Gutenberg branch is actually meant to run alongside, and removing the "previous major version" matrix leg (along with the job that computed which version that was) drops a comparison that only made sense while tracking Core's moving trunk.

Use of AI Tools

This PR was created by Claude Code under my supervision. All code should be treated as AI-produced and not yet reviewed by a human until this PR is marked Ready for Review.

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🟢 Approval recommended

The valid 7.0 branch pin and corresponding workflow cleanup are consistent and complete.

Pull request overview

Pins wp-env to WordPress Core’s 7.0 maintenance branch and simplifies PHP CI accordingly.

Changes:

• Pins both wp-env configurations to WordPress/WordPress#7.0-branch.
• Removes the previous-version lookup and WordPress matrix dimension.

File summaries

File	Description
.wp-env.test.json	Pins test environments to WordPress 7.0.
.wp-env.json	Pins the default environment to WordPress 7.0.
.github/workflows/unit-test.yml	Removes obsolete multi-version PHP testing logic.

Review details

• Files reviewed: 3/3 changed files
• Comments generated: 0
• Review effort level: Balanced

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Co-authored-by: desrosj <desrosj@git.wordpress.org>

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