Feat/319 e2e tests

[gilzow]

Description

• Adds Cypress, configuration files, and an initial set of end-to-end tests
• Adds workflow for running the e2e tests when a pr is created

Related Issue

319

Motivation and Context

To further verify updates to the repository do not introduce regressions

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Visual Regression Testing failed. Please view the report artifact at https://github.com/platformsh-templates/wordpress-composer/actions/runs/10012341836#artifacts

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Visual Regression Testing failed. Please view the report artifact at https://github.com/platformsh-templates/wordpress-composer/actions/runs/10012429003#artifacts

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Visual Regression Testing failed. Please view the report artifact at https://github.com/platformsh-templates/wordpress-composer/actions/runs/10012874201#artifacts

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Visual Regression Testing failed. Please view the report artifact at https://github.com/platformsh-templates/wordpress-composer/actions/runs/10012983073#artifacts

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Visual Regression Testing failed. Please view the report artifact at https://github.com/platformsh-templates/wordpress-composer/actions/runs/10013157809#artifacts

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Visual Regression Testing failed. Please view the report artifact at https://github.com/platformsh-templates/wordpress-composer/actions/runs/10013344015#artifacts

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Visual Regression Testing failed. Please view the report artifact at https://github.com/platformsh-templates/wordpress-composer/actions/runs/10014117631#artifacts

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Visual Regression Testing failed. Please view the report artifact at https://github.com/platformsh-templates/wordpress-composer/actions/runs/10014145201#artifacts

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Visual Regression Testing failed. Please view the report artifact at https://github.com/platformsh-templates/wordpress-composer/actions/runs/10014198401#artifacts

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Visual Regression Testing failed. Please view the report artifact at https://github.com/platformsh-templates/wordpress-composer/actions/runs/10113751869#artifacts

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Visual Regression Testing failed. Please view the report artifact at https://github.com/platformsh-templates/wordpress-composer/actions/runs/10114484485#artifacts

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Visual Regression Testing failed. Please view the report artifact at https://github.com/platformsh-templates/wordpress-composer/actions/runs/10114712199#artifacts