[TRY] Completely refactor std_detect tests

Author: sayantn

.github/workflows/main.yml

@@ -40,6 +40,7 @@ jobs:
     name: Test
     runs-on: ${{ matrix.target.os }}
     strategy:
+      fail-fast: false
       matrix:
         profile:
         - dev

crates/std_detect/Cargo.toml

@@ -40,3 +40,6 @@ rustc-dep-of-std = [
     "compiler_builtins",
     "alloc",
 ]
+
+[lints.rust]
+unexpected_cfgs = {level = "warn", check-cfg = ['cfg(stdarch_test_everything)'] }