ci(graphql): tests for staging variant (#19371)

## Description

Set-up testing for `staging` variant of `sui-graphql-rpc`:

- Split E2E tests into `stable` and `staging` variants (each in their
own sub-directories -- existing tests are all `stable`). Only run the
stable tests by default, and additionally run the staging tests if the
`staging` feature is enabled.
- Generate a separate `staging` schema and snapshot test.
- Add a CI step to run GraphQL tests with the staging flag enabled.

## Test plan

```
sui$ cargo nextest run --profile ci --features staging  \
  -E 'package(sui-graphql-rpc)'                         \
  -E 'package(sui-graphql-e2e-tests)'
```

And also check CI.

---

## 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: 
- [x] GraphQL: Introduce `staging.graphql`. This schema includes changes
that are being developed and tested but have not been productionised
yet.
- [ ] CLI: 
- [ ] Rust SDK:
- [ ] REST API:

.github/workflows/rust.yml

@@ -132,6 +132,9 @@ jobs:
       - name: cargo test
         run: |
           cargo nextest run --profile ci -E '!package(sui-bridge)'
+      - name: cargo test (sui-graphql staging)
+        run: |
+          cargo nextest run --profile ci --features staging -E 'package(sui-graphql-rpc)' -E 'package(sui-graphql-e2e-tests)'
       # Ensure there are no uncommitted changes in the repo after running tests
       - run: scripts/changed-files.sh
         shell: bash

crates/sui-graphql-e2e-tests/Cargo.toml

@@ -25,3 +25,6 @@ harness = false
 
 [target.'cfg(msim)'.dependencies]
 msim.workspace = true
+
+[features]
+staging = ["sui-graphql-rpc/staging"]

crates/sui-graphql-e2e-tests/tests/tests.rs

@@ -8,9 +8,16 @@ use sui_transactional_test_runner::{
     run_test_impl,
     test_adapter::{SuiTestAdapter, PRE_COMPILED},
 };
-pub const TEST_DIR: &str = "tests";
 
-datatest_stable::harness!(run_test, TEST_DIR, r".*\.(mvir|move)$");
+datatest_stable::harness!(
+    run_test,
+    "tests",
+    if cfg!(feature = "staging") {
+        r"\.move$"
+    } else {
+        r"stable/.*\.move$"
+    }
+);
 
 #[cfg_attr(not(msim), tokio::main)]
 #[cfg_attr(msim, msim::main)]

crates/sui-graphql-rpc/Cargo.toml

@@ -91,3 +91,6 @@ sui-framework.workspace = true
 tower.workspace = true
 sui-test-transaction-builder.workspace = true
 sui-move-build.workspace = true
+
+[features]
+staging = []