Only run if .phpcs.xml was found in project

[Sir-Will]

Is your feature request related to a problem? Please describe.
Opening random PHP files which are not formatted for PHP Sniffer always highlights tons of errors which makes it difficult to read.

Describe the solution you'd like
It would be great if there is an option which makes PHP Sniffer to only run if there is a .phpcs.xml file in the project because projects formatted for PHP Sniffer usually have the config file.
This way it's automatically disabled for all PHP files and only enabled for projects which use PHP Sniffer.

Describe alternatives you've considered
Disabling PHP Sniffer globally and creating a workspace for each project and turning it on for these workspaces.

[wongjn]

Thank you for your feedback. Any extension can be disabled on a per-workspace basis — could this not fulfil this request or is it more nuanced than that?

[Sir-Will]

Yea that's what I described as alternative though it would be more convenient to not have to create a workspace and enable the extension there.