add the unity performance library to the test fixture

[richardelms]

NOTE: REQUIRES PERFORMANCE RELEASE BEFORE MERGING

Goal

add the unity performance library to the test fixture so that we have more coverage and are more likely to detect breaking changes between both libs.

Changeset

• add the latest performance release to the fixture on build.
• updated the PlayerSettingsCompat class to have a more specific unity version check.
• added the PlayerSettingsCompat class to the fixture so it can also set UNITY_ASSERTIONS scripting symbol.

Testing

Covered by E2E tests

[bugsnagbot]

Build size impact

Format	Size impact of Bugsnag (kB)
IL2CPP APK	2631.62
IL2CPP IPA	1746.55

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[twometresteve]

LGTM