move rspec / selenium stages to root level
move rspec / selenium stages to root level

refs DE-338

Nospot removal requires all non-build stages to not be wrapped in the protectedNode() function.

Test Plan:
1. RSpec / Selenium stages pass
2. Build Summary Report works correctly

Change-Id: I313b865c1e2758177446905b62a5c7c6f1ed1830
Reviewed-on: https://gerrit.instructure.com/c/canvas-lms/+/262748
Reviewed-by: Kyle Rosenbaum <08c6582752644f4eca90309d6d9805aeb3128ceb@instructure.com>
Tested-by: Service Cloud Jenkins <9144042a601061f88f1e1d7a1753ea3e2972119d@instructure.com>
QA-Review: Aaron Ogata <11ccf682c06d1508642f943a3962a1c3d00b8e44@instructure.com>
Product-Review: Aaron Ogata <11ccf682c06d1508642f943a3962a1c3d00b8e44@instructure.com>

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