feat: Make Lander the default transaction submitter for Sealevel (#7171)

Co-authored-by: Danil Nemirovsky <4614623+ameten@users.noreply.github.com>

Author: ameten

.github/workflows/rust.yml

@@ -18,7 +18,7 @@ concurrency:
 env:
   CARGO_TERM_COLOR: always
   RUST_BACKTRACE: full
-  MIN_LANDERCOVERAGE_PERCENTAGE: 18
+  MIN_LANDERCOVERAGE_PERCENTAGE: 19
   RUSTC_WRAPPER: sccache
 
 jobs:

rust/main/hyperlane-base/src/settings/parser/mod.rs

@@ -268,9 +268,9 @@ fn parse_chain(
     let submitter = match submitter {
         Some(submitter_type) => submitter_type,
         None => match connection.protocol() {
-            HyperlaneDomainProtocol::Ethereum | HyperlaneDomainProtocol::Radix => {
-                SubmitterType::Lander
-            }
+            HyperlaneDomainProtocol::Ethereum
+            | HyperlaneDomainProtocol::Radix
+            | HyperlaneDomainProtocol::Sealevel => SubmitterType::Lander,
             _ => Default::default(),
         },
     };