Add hardened runtime testing to Catalina lane (mono/mono#15589)

* Permit DYLD mangling, so p/invokes work from non-system paths

* Add com.apple.security.cs.disable-library-validation

This is required for the .dylibs used in p/invokes to work.

* Use adhoc signing


Commit migrated from mono/mono@202dca0

src/mono/mono/mini/mac-entitlements.xml

@@ -0,0 +1,7 @@
+<plist version="1.0">
+	<dict>
+		<key>com.apple.security.cs.allow-jit</key><true/>
+		<key>com.apple.security.cs.allow-dyld-environment-variables</key><true/>
+		<key>com.apple.security.cs.disable-library-validation</key><true/>
+	</dict>
+</plist>