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chore: Parallelize Tests #130

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This will use all available cores to run tests, and parallelize by all - suite/class/method. On machines with multiple cores, this will vastly improve test performance. These times are on my M1 MBP with 10 (8P + 2E) cores. They were reported by maven on running mvn verify.

I first ran mvn verify and ignored the time.
Then I ran it thrice without this change, and thrice with this change.

All times in seconds.

Run 1 Run 2 Run 3 Average
Before 107 104 107 106
After 54 54 56 55
Savings 51
% 48

Testing done

All existing tests pass

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This will use all available cores to run tests, and parallelize by all - suite/class/method.
On machines with multiple cores, this will vastly improve test performance.
These times are on my M1 MBP with 10 (8P + 2E) cores. They were reported by maven on running `mvn verify`.

I first ran `mvn verify` and ignored the time.
Then I ran it thrice without this change, and thrice with this change.

All times in seconds.

|        | Run 1 | Run 2 | Run 3 | Average |
| ------ | ----: | ----: | ----: | ------: |
| Before |   107 |   104 |   107 |     106 |
| After  |    54 |    54 |    56 |      55 |
| Savings|       |       |       |      51 |
| %      |       |       |       |      48 |
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forkCount may be set in Jenkinsfile now.

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