Split up system tests for speed #18211
Part of #17878
Summary of the issue:
System tests are the slowest part of the GitHub actions build, taking about 20min.
System tests could be split up to speed up the build, run in parallel via a matrix.
Description of user facing changes:
None
Description of developer facing changes:
System tests speed will reduce by 3min.
System test suite results will be created separately.
Install logs will be in the same artifact as the rest of each system test suites results.
Description of development approach:
Use a matrix and env variable to set the system test suite up to run test suites simultaneously across runners.
