Update workspace & add nx directly instead of nrwl

[Clemsazert]

This PR tries to fix all the issues I encountered during while trying to setup the keïko.

• It seems pnpm 8 now requires a non empty array value for packages field in pnpm-workspace.yaml. Added the value "packages/*"
• Failed to run any scripts using nxwith error nx: command not found, although it should be provided by @nrwl/cli package. Removed @nrwl/cli and @nrwl/tao and installed nx directly instead
• For nx >= 17, workspace.json should be replaced by project.json fiels inside each package. As a fix I ran the command nx g @nx/workspace:fix-configuration as provided in nx migration documentation.
• For nx >= 17, the syntax for declaring targetDependencies is different. It relies on targetDefaults => migrated to new declaration spec. Removed the nrwl runner as it was not available anymore.
• Add a remove target in root package.json to make easier cleaning resources after the keïko
• It seems there is a bug with caching in nx 17 (After upgrading to nx 17 cache directory setting seems ignored and produces a .nx directory at project root nrwl/nx#21120). Removed custom cache directory (.nx/cache by default).