chore: improve --embedded-database messaging

[ra0x3]

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Description

• This PR does not detect auto-failure of --embedded-database - that would be pretty hard to do. But it does improve messaging when using --embedded-database

Testing steps

• Update forc index start with local binary path let mut cmd = Command::new("./target/release/fuel-indexer");
• Build binaries locally cargo build -p forc-index -p fuel-indexer -p fuel-indexer-api-server --release --locked
• Run forc index cargo run --bin forc-index -- start --embedded-database --run-migrations --verbose
• Should see more informative messaging related to --embedded-database flag

Changelog

• chore: improve --embedded-database messaging

[deekerno]

utACK