chore: 🤖 Devtools cleanup, generalized build process

[jsimck]

devtools was add to workspaces and cleaned up. Additional changes:

• Removed multiple invaluable tests (in form of rendering the same snapshots without any value)
• Merged webpack configurations for devtools and error-overlay to have the same process
• Hoisted multiple devDependencies related to common webpack config to root package.json for better maintenance
• migrated from webpack-cli to webpack-nano as it is much smaller package and we use it only tu run webpack config from command line (nothing else)
• eslint-plugin-import is now applied to devtools package too
• Moved devtools-scripts "string version" build from inline npm script to rollup config for better maintenance.
• Added .module suffix to *.less files, since CSS modules are now optional (with proper suffix) and not enabled by default in the common config