Add get-task-allow entitlement to allow debuggers to attach to code…

…signed Julia (#37069)

Without this entitlement, users that wish to attach a debugger to the
codesign Julia executable they receive from `julialang.org` must strip
the codesigning signature from the Julia executable (e.g. via `codesign
--remove-signature Julia-1.5.app/Contents/Resources/bin/julia`).  This
has its disadvantages, of course, so much better to simply declare to
the OS that it's alright for other processes to attach to this process.

(cherry picked from commit bf8a8e8)

contrib/mac/app/Entitlements.plist

@@ -4,6 +4,8 @@
 <dict>
  <key>com.apple.security.automation.apple-events</key>
  <true/>
+ <key>com.apple.security.cs.get-task-allow</key>
+ <true/>
  <key>com.apple.security.cs.allow-dyld-environment-variables</key>
  <true/>
  <key>com.apple.security.cs.allow-jit</key>