Mitigate issues with Sandcastle simulators

Summary:
This change updates the offline mirrors and remove the need for destinations in Sandcastle jobs, to mitigate the problem with the oss jobs we are facing.

allow-large-files

## Changelog:
[internal] - update offline mirror and don't run tests on simulators

Reviewed By: robhogan, dmytrorykun

Differential Revision: D44056468

fbshipit-source-id: c4db37a715eb1307a01a33b1917573f67ed0e2a7

packages/rn-tester/Podfile.lock

@@ -999,7 +999,7 @@ SPEC CHECKSUMS:
   FlipperKit: 2efad7007d6745a3f95e4034d547be637f89d3f6
   fmt: ff9d55029c625d3757ed641535fd4a75fedc7ce9
   glog: 04b94705f318337d7ead9e6d17c019bd9b1f6b1b
-  hermes-engine: a3aafd582c2460eb341f717ee861ee2fe7ca7e6b
+  hermes-engine: e33b68f27408adcf86e955eb0337f9349f4fb0ed
   libevent: 4049cae6c81cdb3654a443be001fb9bdceff7913
   OCMock: 9491e4bec59e0b267d52a9184ff5605995e74be8
   OpenSSL-Universal: ebc357f1e6bc71fa463ccb2fe676756aff50e88c