devdeps: upgrade @map-colonies/eslint-config to 8.1.0 and drop unused jest deps

[ronenkapelian]

Summary

• Upgrade @map-colonies/eslint-config from ^8.0.0 to 8.1.0 and add the new @map-colonies/eslint-plugin 0.1.0 which is now a direct dependency of the config
• ESLint was already at ^10.0.0 — no change needed there
• Remove unused eslint-plugin-jest and ts-jest — the project runs vitest and neither was wired into the ESLint config or the test runner
• Replace the direct body-parser import in serverBuilder.ts with the named json export from express to fix the import-x/no-extraneous-dependencies error introduced by the stricter import-x v4 rules bundled in the new config (body-parser was never a listed dependency — it was only available as a transitive dep of express)