Nicely format `cargo metadata` error message

[ggwpez]

Currently looks like this when cargo metadata fails 🙈

thread 'main' panicked at src/cmd/lint.rs:820:52:
Loads metadata: "Failed to load metadata: `cargo metadata` exited with an error: error: failed to load manifest for workspace member `/Users/vados/Documents/work/polkadot-sdk/bridges/bin/runtime-common`\nreferenced by workspace at `/Users/vados/Documents/work/polkadot-sdk/Cargo.toml`\n\nCaused by:\n  failed to load manifest for dependency `bp-header-chain`\n\nCaused by:\n  failed to load manifest for dependency `bp-runtime`\n\nCaused by:\n  failed to load manifest for dependency `frame-support`\n\nCaused by:\n  failed to load manifest for dependency `binary-merkle-tree`\n\nCaused by:\n  failed to load manifest for dependency `sp-runtime`\n\nCaused by:\n  failed to load manifest for dependency `sp-application-crypto`\n\nCaused by:\n  failed to load manifest for dependency `sp-io`\n\nCaused by:\n  failed to load manifest for dependency `sp-runtime-interface`\n\nCaused by:\n  failed to load manifest for dependency `sp-runtime-interface-test-wasm`\n\nCaused by:\n  failed to load manifest for dependency `substrate-wasm-builder`\n\nCaused by:\n  failed to load manifest for dependency `sc-executor`\n\nCaused by:\n  failed to load manifest for dependency `sc-tracing`\n\nCaused by:\n  failed to load manifest for dependency `sc-client-api`\n\nCaused by:\n  failed to load manifest for dependency `substrate-test-runtime`\n\nCaused by:\n  failed to load manifest for dependency `frame-executive`\n\nCaused by:\n  failed to load manifest for dependency `frame-system`\n\nCaused by:\n  failed to load manifest for dependency `substrate-test-runtime-client`\n\nCaused by:\n  failed to load manifest for dependency `substrate-test-client`\n\nCaused by:\n  failed to load manifest for dependency `sc-client-db`\n\nCaused by:\n  failed to load manifest for dependency `kitchensink-runtime`\n\nCaused by:\n  failed to load manifest for dependency `polkadot-sdk`\n\nCaused by:\n  failed to load manifest for dependency `asset-test-utils`\n\nCaused by:\n  failed to load manifest for dependency `cumulus-pallet-parachain-system`\n\nCaused by:\n  failed to load manifest for dependency `cumulus-test-client`\n\nCaused by:\n  failed to load manifest for dependency `cumulus-test-service`\n\nCaused by:\n  failed to load manifest for dependency `cumulus-client-collator`\n\nCaused by:\n  failed to load manifest for dependency `cumulus-client-network`\n\nCaused by:\n  failed to parse manifest at `/Users/vados/Documents/work/polkadot-sdk/cumulus/client/network/Cargo.toml`\n\nCaused by:\n  Dependency 'sp-consensus' has different source paths depending on the build target. Each dependency must have a single canonical source path irrespective of build target.\n"
note: run with `RUST_BACKTRACE=1` environment variable to display a backtrace