tests.nixpkgs-check-by-name: added test that fails multiple validity checks

pkgs/test/nixpkgs-check-by-name/tests/multiple-failures/default.nix

@@ -0,0 +1 @@
+import <test-nixpkgs> { root = ./.; }

pkgs/test/nixpkgs-check-by-name/tests/multiple-failures/expected

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+pkgs/by-name/A: Invalid directory name "A", must be at most 2 ASCII characters consisting of a-z, 0-9, "-" or "_".
+pkgs/by-name/A/fo@: Invalid package directory name "fo@", must be ASCII characters consisting of a-z, A-Z, 0-9, "-" or "_".
+pkgs/by-name/A/fo@: Path foo.nix is a symlink which cannot be resolved: No such file or directory (os error 2).
+pkgs/by-name/A/fo@: Path package.nix is a symlink pointing to a path outside the directory of that package.
+pkgs/by-name/aa: This is a file, but it should be a directory.
+pkgs/by-name/ba/bar: This path is a file, but it should be a directory.
+pkgs/by-name/ba/baz: "package.nix" must be a file.
+pkgs/by-name/ba/foo: Incorrect directory location, should be pkgs/by-name/fo/foo instead.
+pkgs/by-name/ba/foo: File invalid.nix could not be parsed by rnix: unexpected token at 28..29
+pkgs/by-name/ba/foo: File package.nix at line 2 contains the path expression "/bar" which cannot be resolved: No such file or directory (os error 2).
+pkgs/by-name/ba/foo: File package.nix at line 3 contains the path expression "../." which may point outside the directory of that package.
+pkgs/by-name/ba/foo: File package.nix at line 4 contains the nix search path expression "<nixpkgs>" which may point outside the directory of that package.
+pkgs/by-name/ba/foo: File package.nix at line 5 contains the path expression "./${"test"}", which is not yet supported and may point outside the directory of that package.
+pkgs/by-name/fo/foo: Missing required "package.nix" file.

pkgs/test/nixpkgs-check-by-name/tests/multiple-failures/pkgs/by-name/A/fo@/foo.nix

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+../../../../foo.nix

pkgs/test/nixpkgs-check-by-name/tests/multiple-failures/pkgs/by-name/A/fo@/package.nix

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+../../../../someDrv.nix

pkgs/test/nixpkgs-check-by-name/tests/multiple-failures/pkgs/by-name/ba/baz/package.nix/default.nix

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+{ someDrv }: someDrv

pkgs/test/nixpkgs-check-by-name/tests/multiple-failures/pkgs/by-name/ba/foo/invalid.nix

@@ -0,0 +1 @@
+this is not a valid nix file!

pkgs/test/nixpkgs-check-by-name/tests/multiple-failures/pkgs/by-name/ba/foo/package.nix

@@ -0,0 +1,6 @@
+{ someDrv }: someDrv // {
+  escape = /bar;
+  escape = ../.;
+  nixPath = <nixpkgs>;
+  pathWithSubexpr = ./${"test"};
+}

pkgs/test/nixpkgs-check-by-name/tests/multiple-failures/someDrv.nix

@@ -0,0 +1 @@
+{ someDrv }: someDrv