Adjust when we build for code coverage when it isn't enabled #3257
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Fixes #3255 (partially)
For builds where code coverage is not enabled in the scheme's test action, do not build with coverage. Should reduce thrash in index builds and address a regression in the cache performance of Xcode builds that hadn't opted into this feature.
Note: this does not fix the issue for build-for-running builds of tests, as we have no clear-cut way of differentiating between build-for-running and build-for-testing in the BazelDependencies run script phase. Open to other ideas, since this is based on undocumented xcodebuild behavior and is not super-nice.