Add end-to-end tests for comment moderation on edit-comments.php

[csmcneill]

Comment moderation has no end-to-end coverage: approving, unapproving, marking as spam, replying from the admin, and bulk spam actions are all untested.

A spec covering those flows is open as a PR: ​https://github.com/WordPress/wordpress-develop/pull/12667

The tests self-provision their comments over the REST API, use role-based locators against the current markup, and clean up after themselves. Green across the full CI matrix. It complements the quick-edit/delete coverage proposed in ​https://github.com/WordPress/wordpress-develop/pull/8089 rather than duplicating it.

Part of a series adding e2e coverage for classic admin surfaces — see #52895.

e2e test that covers approving, unapproving, spamming, replying from the admin, and bulk spam via edit-comments.php — admin surfaces with no existing e2e coverage.

Comment moderation is one of the oldest admin workflows and currently has no e2e coverage. These tests self-provision their comments over the REST API, use role-based locators against the post-Reskin markup, and clean up after themselves.

This complements the in-flight quick-edit/delete work in #8089 rather than duplicating it — that PR covers viewing, quick-editing, and deleting; this one covers moderation state transitions and bulk actions.

Trac ticket: https://core.trac.wordpress.org/ticket/65771
Trac ticket: https://core.trac.wordpress.org/ticket/52895

## Verification

• Passes in this repository's local Docker environment against trunk (repeated runs).
• Also verified against WordPress 7.0.2 and 7.1-beta3 installs (wp-env) as part of a legacy-surface regression-testing effort for 7.1.

## Use of AI Tools

AI assistance: Yes
Tool(s): Claude (Claude Code via ​Craft Agents)
Agent(s): Fable 5
Used for: Test authoring and cross-environment verification, with human review; reviewed and submitted by the author.