improved error reporting when unexpected went wrong

[mrtuvn]

Description (*)

show an error/exception in the browser's console allow developer can figure what exactly problem when something went wrong.
Message "Something went wrong with your request. Please try again later." not useful for debugging. We dont need that context for check problem as developer.

Related Pull Requests

Fixed Issues (if relevant)

1. Fixes magento/magento2#<issue_number>

Manual testing scenarios (*)

1. ...
2. ...

Questions or comments

Contribution checklist (*)

• Pull request has a meaningful description of its purpose
• All commits are accompanied by meaningful commit messages
• All new or changed code is covered with unit/integration tests (if applicable)
• README.md files for modified modules are updated and included in the pull request if any README.md predefined sections require an update
• All automated tests passed successfully (all builds are green)

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[mrtuvn]

the question here we actual want to expose errors to console may cause vulnerable web application ?