Test handling of multiple formatters

[jrieken]

Refs: #41882

• any @octref
• any @isidorn

Complexity: 3

We have improved the behaviour when having multiple formatters for a document. Install 'conflicting' formatter extensions like beautify and/or prettier and test that

• there are new actions 'Format Document With...' and 'Format Selection With...' which show quick pick allowing you to select an extension that's used to format
• clicking the gear icon in the formatter pick opens the extensions viewlet for that extension - allows to configure/disable/uninstall it
• there is also 'Format Document' and 'Format Selection' which in case of multiple extensions just pick one and then print on the status bar which it picked
• format on save and format on paste also print to status bar which formatter was selected, also only when multiple formatters exists

*Note that format selection only shows when an extension contributes such a provider.

[octref]

Great work 👍