[4.2] [BatchMode] Avoid spurious warnings in sourcekitd and indexing #16076
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Cherry-pick #16067 and #16074
Explicitly disable batch mode in createCompilerInvocation, since it uses
-force-single-frontend-invocation. Previously we were getting spurious
warnings. Also add a test that -disable-batch-mode will allow commands
that use -index-file to avoid the same warning, since that is likely
what they want to do as well.
rdar://39581506