Rework TxStatusManager tests (#2871)

Closes #2837

## Description
This PR makes the tests for `TxStatusManager` more lean. Mainly it
removes duplication of tests (some tests were testing for the same
thing, but in slightly different way) and covers some more cases.

## Checklist
- [X] New behavior is reflected in tests

### Before requesting review
- [X] I have reviewed the code myself

---------

Co-authored-by: Green Baneling <[email protected]>

Author: rafal-ch

crates/services/tx_status_manager/Cargo.toml

@@ -25,8 +25,12 @@ tracing = { workspace = true }
 [dev-dependencies]
 fuel-core-services = { workspace = true, features = ["test-helpers"] }
 fuel-core-tx-status-manager = { path = ".", features = ["test-helpers"] }
-fuel-core-types = { path = "./../../types", features = ["test-helpers"] }
+fuel-core-types = { path = "./../../types", features = [
+  "test-helpers",
+  "serde",
+] }
 mockall = { workspace = true }
+postcard = { workspace = true }
 proptest = { workspace = true }
 test-case = { workspace = true }
 test-strategy = { workspace = true }

crates/services/tx_status_manager/src/lib.rs

@@ -15,7 +15,6 @@ mod tx_status_stream;
 mod update_sender;
 pub mod utils;
 
-pub use manager::TxStatusManager;
 pub use service::{
     new_service,
     SharedData,