remove std/testing/runner.ts, use deno test for std/ tests (#4397)

This introduces BREAKING CHANGE by removing "std/testing/runner.ts".

Std tests are now run using "deno test" subcommand.

1 files changed, 0 insertions, 1 deletions

diff --git a/std/testing/testdata/foo.ts b/std/testing/testdata/foo.ts
deleted file mode 100644
index cb0ff5c3b..000000000
--- a/std/testing/testdata/foo.ts
+++ /dev/null
@@ -1 +0,0 @@
-export {};