Switch GHA test stats S3 upload token (#58156)
Summary:
TODOs:
- [x] generate a temporary new token on this repo for testing purposes
- [x] change the name of the S3 secret used in the workflow YAML definitions
- [x] check the test plan
- [x] replace the temporary token with a more permanent one
- [x] check the test plan again
- [x] uncomment the `if` statement that guards against uploading PR test stats
Pull Request resolved: https://github.com/pytorch/pytorch/pull/58156
Test Plan: Check the [ossci-metrics bucket](https://s3.console.aws.amazon.com/s3/buckets/ossci-metrics) after CI runs on this PR. Specifically, [this prefix](https://s3.console.aws.amazon.com/s3/buckets/ossci-metrics?region=us-east-1&prefix=test_time/a3445bfbd7efc602c28f5146fb562aa35ec50077/pytorch-linux-xenial-py3.6-gcc5.4/&showversions=false) has two objects under it.
Reviewed By: janeyx99
Differential Revision: D28393138
Pulled By: samestep
fbshipit-source-id: 2c39c102652d471afa016cfc4942bb1e5bbb4163
