[codecov-ci] Enable verbose mode for cargo llvm-cov (#18630)

## Description 

Enable verbose mode for cargo llvm-cov

## Test plan 

How did you test the new or updated feature?

---

## Release notes

Check each box that your changes affect. If none of the boxes relate to
your changes, release notes aren't required.

For each box you select, include information after the relevant heading
that describes the impact of your changes that a user might notice and
any actions they must take to implement updates.

- [ ] Protocol: 
- [ ] Nodes (Validators and Full nodes): 
- [ ] Indexer: 
- [ ] JSON-RPC: 
- [ ] GraphQL: 
- [ ] CLI: 
- [ ] Rust SDK:

.github/workflows/cargo-llvm-cov.yml

@@ -54,7 +54,7 @@ jobs:
  swap-size-gb: 256
 
  - name: Run code coverage for nextest
- run: SUI_SKIP_SIMTESTS=1 cargo llvm-cov --ignore-run-fail --lcov --output-path lcov.info nextest
+ run: SUI_SKIP_SIMTESTS=1 cargo llvm-cov --ignore-run-fail --lcov --output-path lcov.info nextest -vv
 
  - name: Upload report to Codecov for nextest
  uses: codecov/codecov-action@e0b68c6749509c5f83f984dd99a76a1c1a231044 # pin v4.0.1