NEXT-0000 - Improve write exception message to include property, that has faulty content

[JoshuaBehrens]

1. Why is this change necessary?

When you do a bad API request, you do not understand why it is bad.

2. What does this change do, exactly?

Add the field name to the path mentioned in the exception.

3. Describe each step to reproduce the issue or behaviour.

1. Use the API and create data
2. Send request:

POST /api/seo-url-template
Content-Type: application/json
Accept: application/json

{
    "id": "118f8e56b0da7d81a4392f876b3b5ee6",
    "salesChannel": "foo",
    "entityName": "product",
    "routeName": "foobar",
    "template": "foo"
}

3. Get error response with message Expected data at /0 to be an array
4. 

4. Checklist

• I have rebased my changes to remove merge conflicts
• I have written tests and verified that they fail without my change
• I have created a changelog file with all necessary information about my changes
• I have written or adjusted the documentation according to my changes
• This change has comments for package types, values, functions, and non-obvious lines of code
• I have read the contribution requirements and fulfil them.

[shopware-github-importer]

Hello,

thank you for creating this pull request.
I have opened an issue on our Issue Tracker for you. See the issue link: https://issues.shopware.com/issues/NEXT-36325

Please use this issue to track the state of your pull request.

[keulinho]

Hey @JoshuaBehrens thanks for your contribution! Your PR just got merged 🎉 💙

[JoshuaBehrens]

Thank you for merging :)