Removed all instances of memberWelcomeEmailTestInbox configuration

[cmraible]

closes https://linear.app/ghost/issue/NY-1086/remove-the-memberwelcomeemailtestinbox-configuration-from-ghost

We no longer use the memberWelcomeEmailTestInbox configuration parameter anywhere in Ghost, but it still exists in defaults.json and a few other configuration fixtures, as well as our e2e tests. This removes any and all references to this obsolete configuration parameter from the codebase.

[coderabbitai]

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📥 Commits

Reviewing files that changed from the base of the PR and between 7213788 and 9d28fba.

📒 Files selected for processing (5)

• e2e/helpers/playwright/fixture.ts
• ghost/core/core/shared/config/defaults.json
• ghost/core/core/shared/config/env/config.testing-mysql.json
• ghost/core/core/shared/config/env/config.testing.json
• href.md

💤 Files with no reviewable changes (1)

• e2e/helpers/playwright/fixture.ts

🚧 Files skipped from review as they are similar to previous changes (2)

• ghost/core/core/shared/config/env/config.testing.json
• ghost/core/core/shared/config/env/config.testing-mysql.json

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Walkthrough

This pull request removes the memberWelcomeEmailTestInbox configuration property across the codebase. The property is deleted from the GhostConfig interface in e2e/helpers/playwright/fixture.ts and from the configuration files ghost/core/core/shared/config/defaults.json, ghost/core/core/shared/config/env/config.testing.json, and ghost/core/core/shared/config/env/config.testing-mysql.json. No other keys or values are modified.

🚥 Pre-merge checks | ✅ 3

✅ Passed checks (3 passed)

Check name	Status	Explanation
Title check	✅ Passed	The pull request title clearly and concisely summarizes the main change: removal of all instances of the memberWelcomeEmailTestInbox configuration parameter.
Description check	✅ Passed	The pull request description is directly related to the changeset, explaining why memberWelcomeEmailTestInbox is being removed and which files are affected.
Docstring Coverage	✅ Passed	No functions found in the changed files to evaluate docstring coverage. Skipping docstring coverage check.

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• Commit unit tests in branch chris-ny-1086-remove-the-memberwelcomeemailtestinbox-configuration-from

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[cmraible]

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