fix: add baseUrl to TestConfigOverrides

[imadx]

• Closes Cypress.config('baseUrl', 'someUrl.com') after v10 upgrade #22374
• Closes Dynamically setting baseUrl with TestConfigOverrides #22072

User-facing changelog

Corrected the Typescript types to include baseUrl as a valid test config override option. Fixes #22374 and #22072.

Additional details

The documentation mentions that baseUrl is also configurable and can be changed at run time.
https://docs.cypress.io/guides/references/configuration#Test-Configuration

However, the types are missing baseUrl there for TestConfigOverrides.

Steps to test

Updating baseUrl in a test with Cypress.config("baseUrl", baseUrl); can be used to test the behaviour.

How has the user experience changed?

Before

After

There is no typescript warning

PR Tasks

• Have tests been added/updated?
• Has the original issue (or this PR, if no issue exists) been tagged with a release in ZenHub? (user-facing changes only)
• Has a PR for user-facing changes been opened in cypress-documentation?
• Have API changes been updated in the type definitions?

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