chore(ci): gate replay test with #[ignore] instead of test = false

Previously, `[[test]] test = false` excluded `tests/replay.rs` from
`cargo check --tests` and `cargo clippy --all-targets`, so clippy and
the type checker silently stopped looking at the file. With this commit,
the replay test uses `#[ignore]` to stay out of default `cargo test`
runs while remaining visible to lints and compilation.

The replay workflow now opts in with `cargo test --test replay --
--ignored --nocapture`.

Author: Brandon Williams

.github/workflows/replay.yml

@@ -67,7 +67,7 @@ jobs:
             exit 1
           fi
       - run: rustup toolchain install stable --profile minimal
-      - run: cargo test --release --test replay -- --nocapture
+      - run: cargo test --release --test replay -- --ignored --nocapture
         env:
           DIFFY_TEST_REPO: ${{ inputs.repo_url == '' && '.' || 'target/test-repo' }}
           DIFFY_TEST_COMMITS: ${{ inputs.commits }}

Cargo.toml

@@ -25,7 +25,3 @@ snapbox = { version = "0.6.24", features = ["dir"] }
 [[example]]
 name = "patch_formatter"
 required-features = ["color"]
-
-[[test]]
-name = "replay"
-test = false

tests/replay.rs

@@ -445,7 +445,11 @@ fn process_commit(repo: &Path, parent: &str, child: &str, mode: TestMode) -> Com
     }
 }
 
+// Ignored by default so `cargo test` stays fast; CI opts in via `--ignored`.
+// Using `#[ignore]` instead of `test = false` keeps the file in clippy's
+// `--all-targets` view so lints still fire here.
 #[test]
+#[ignore = "replay test runs git subprocesses; opt in via --ignored"]
 fn replay() {
     let repo = repo_path();
     let selection = commit_selection();