Treat all files with `git{config,attributes,modules}`/`editorconfig` extensions as properties files

fix: add missing property to deserializeRunnable

Signed-off-by: NVitaliy Gulyy <vgulyy@redhat.com>

This reverts commit 1ca18ed8.

Closes microsoft/vscode-internalbacklog/issues/1208

Adds a simple set of tests for custom editors in a new extension. This is currently not run during CI since we want more testing to make sure it is reliable

Fixes #92868

Fixes #101451

fixes #103165

Fixes #98918