feat: implement report problem with form submission API path

[craigzour]

Summary | Résumé

Linked with:

• feat: add Freshdesk API key secret to API ECS task forms-terraform#795
• feat: add ENVIRONMENT_MODE env var to API ECS task forms-terraform#797

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• Adds new /problem API path to report problem with form submission
• Introduces express-validator package to validate the JSON payload required by the new /problem POST operation
• Introduces a new EnvironmentMode variable. For this feature it is used to add custom tags to the Freshdesk ticket and make sure we are not trying to create ticket in local mode.

[craigzour]

Selected https://express-validator.github.io/docs for now.
The way it is implemented in our code (middleware) makes it easy to change in the future if we are not happy with it.
Also, even though express-validator provides ready to use middleware functions, I decided to create a custom one because it is easier to control the error response when the validation fails. Otherwise we would have to create a new middleware function to catch the specific error thrown by the library.

Existing other options:

• https://github.com/simonplend/express-json-validator-middleware (provides middleware function)
• https://github.com/ajv-validator/ajv (would have to be inserted in middleware function)

[craigzour]

Tags have been discussed with Jimmy from our support team.

[craigzour]

Add to re implement this condition as the way we mock the configuration variables during Vitest setup has been implemented in a way that will load the config file (importOriginal) as is before altering its content for testing purpose. Since the code in the config file will be executed it will try to load variables that don't exist in the Github Action environment.

[bryan-robitaille]

Nice work. Since this project is still very young we'll continue to refactor and see what patterns work and what might need changing as we go along.