Readd bad-switch and directory-redirection tests

Made possible by the power of regex.

tests/checks/bad-option.fish

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+#RUN: %fish -Z
+#CHECKERR: {{.*fish}}: {{unrecognized option: Z|invalid option -- '?Z'?}}

tests/checks/directory-redirect.fish

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+#RUN: %fish -c 'begin; end > . ; status -b; and echo "status -b returned true after bad redirect on a begin block"; echo $status'
+# Note that we sometimes get fancy quotation marks here, so let's match three characters
+#CHECKERR: <W> fish: An error occurred while redirecting file {{...}}
+#CHECKERR: {{open: Is a directory|open: Invalid argument}}
+#CHECK: 1

tests/invocation/bad-switch.err

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-./fish: invalid option -- 'Z'
-RC: 1

tests/invocation/bad-switch.err.Darwin

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-fish: invalid option -- Z
-RC: 1

tests/invocation/bad-switch.invoke.disabled

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--Z

tests/invocation/directory-redirect.err

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-<W> fish: An error occurred while redirecting file '.'
-open: Is a directory
-RC: 1

tests/invocation/directory-redirect.err.SunOS

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-<W> fish: An error occurred while redirecting file '.'
-open: Invalid argument
-RC: 1

tests/invocation/directory-redirect.invoke.disabled

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--c 'begin; end > . ; status -b; and echo "status -b returned true after bad redirect on a begin block"'