Rollup merge of #89082 - smoelius:master, r=kennytm

Implement #85440 (Random test ordering)

This PR adds `--shuffle` and `--shuffle-seed` options to `libtest`. The options are similar to the [`-shuffle` option](c894b442d1/src/testing/testing.go (L1482-L1499)) that was recently added to Go.

Here are the relevant parts of the help message:
```
        --shuffle       Run tests in random order
        --shuffle-seed SEED
                        Run tests in random order; seed the random number
                        generator with SEED
...
By default, the tests are run in alphabetical order. Use --shuffle or set
RUST_TEST_SHUFFLE to run the tests in random order. Pass the generated
"shuffle seed" to --shuffle-seed (or set RUST_TEST_SHUFFLE_SEED) to run the
tests in the same order again. Note that --shuffle and --shuffle-seed do not
affect whether the tests are run in parallel.
```
Is an RFC needed for this?

src/tools/compiletest/src/main.rs

@@ -506,6 +506,8 @@ pub fn test_opts(config: &Config) -> test::TestOpts {
             Err(_) => false,
         },
         color: config.color,
+        shuffle: false,
+        shuffle_seed: None,
         test_threads: None,
         skip: vec![],
         list: false,