Problems and suggested solutions should be marked with plugin-name

[rivy]

Currently, when a value violates schema, suggestions do not mention this as the plugin which enables the warning/error.

For example, an example violation text is Value is not accepted. Valid values: "${{ matrix.os }}", "macos-latest", "macos-10.15", "self-hosted", "ubuntu-16.04", "ubuntu-18.04", "ubuntu-20.04", "ubuntu-latest", "windows-latest", "windows-2019".(1). This makes it difficult to diagnose where such a suggestion is being generated (sometimes needed when the warning is invalid, as here).

As an example of attribution, the "Code Spell Checker" shows suggestion texts like "anyy": Unknown word.cSpell.

A better version here might be Value is not accepted. Valid values: "${{ matrix.os }}", "macos-latest", "macos-10.15", "self-hosted", "ubuntu-16.04", "ubuntu-18.04", "ubuntu-20.04", "ubuntu-latest", "windows-latest", "windows-2019".(YAML).

[evidolob]

@rivy We have similar request redhat-developer/yaml-language-server#310

[rivy]

@evidolob , Thanks!