[TEST] Switch to use new swift-driver when running tests #85930
+137
−20
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Default to use new swift-driver to run lit tests as legacy swift driver is deprecated for a long time. The lit tests for legacy drivers are also disable when running new swift-driver.
Tests that relies on legacy swift driver (for example, tests merge module) can be enabled on conditions
legacy_swift_driver. Fix and split up some existing tests that relies on legacy driver.