Improve test coverage of set_view.rs from 38.18% to 86.78% (#4782)

## Motivation

Test coverage helps to strenghten the quality of the software. and allow
to know precisely what is working or not.

## Proposal

This was done by systematically adding tests.
In passing two typos from previous PRs were cleaned up.

## Test Plan

Testing is the purpose of the PR.

## Release Plan

This could be backported to TestNet Conway.

## Links

None.

Author: MathieuDutSik

Cargo.toml

@@ -330,7 +330,6 @@ non-fungible = { path = "./examples/non-fungible" }
 publish-read-data-blob = { path = "./linera-sdk/tests/fixtures/publish-read-data-blob" }
 social = { path = "./examples/social" }
 time-expiry = { path = "./linera-sdk/tests/fixtures/time-expiry" }
-track-instantiation = { path = "./examples/track-instantiation" }
 
 [workspace.dependencies.aws-config]
 default-features = false

linera-service/tests/linera_net_tests.rs

@@ -28,7 +28,6 @@ use linera_base::{
     time::{Duration, Instant},
     vm::VmRuntime,
 };
-//use OnClientDrop::*;
 use linera_core::worker::{Notification, Reason};
 use linera_sdk::{
     abis::fungible::NativeFungibleTokenAbi,