Rollup merge of #73267 - ehuss:cargotest-this-cargo, r=Mark-Simulacrum

Use the built cargo for cargotest.

cargotest was using the beta (bootstrap) cargo. This changes it so that it will use the locally built cargo. This is intended to provide a sort of smoke test to ensure Cargo is functional. This *shouldn't* have any real impact on the CI build time.  The cargotest job also happens to run cargo's testsuite, so it should already be building cargo.

Note: This will fail until #73266 is merged.

src/bootstrap/test.rs

@@ -154,6 +154,7 @@ fn make_run(run: RunConfig<'_>) {
     fn run(self, builder: &Builder<'_>) {
         let compiler = builder.compiler(self.stage, self.host);
         builder.ensure(compile::Rustc { compiler, target: compiler.host });
+        let cargo = builder.ensure(tool::Cargo { compiler, target: compiler.host });
 
         // Note that this is a short, cryptic, and not scoped directory name. This
         // is currently to minimize the length of path on Windows where we otherwise
@@ -165,7 +166,7 @@ fn run(self, builder: &Builder<'_>) {
         let mut cmd = builder.tool_cmd(Tool::CargoTest);
         try_run(
             builder,
-            cmd.arg(&builder.initial_cargo)
+            cmd.arg(&cargo)
                 .arg(&out_dir)
                 .env("RUSTC", builder.rustc(compiler))
                 .env("RUSTDOC", builder.rustdoc(compiler)),