Enable FixAll testing by default for all code fix tests #1773
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All the VerifyXXXFix test helpers now take an optional FixAllScope, which defaults to document/project based on whether the test verifies a single document or multiple documents. After validating the individual diagnostic code fix, the test framework also invokes the FixAll and verifies the result is identical.
For unit tests which have multiple fixable diagnostics in the original source code, they should explicitly disable FixAll testing in the VerifyXXXFix call by passing a null FixAllScope and have a separate FixAll test with appropriate baseline.
For code fixers which have no FixAll support, they can override the
TestFixAllByDefault
property to turn off FixAll testing for all it's unit tests.Fixes #1420