Factor out -index-ignore-system-modules
into a separate feature
#1252
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The feature has opposite polarity to the compiler flag, as we want it to be off by default and only enabled on certain targets.
PiperOrigin-RevId: 467693984
(cherry picked from commit 14e066f)
Cherry-pick notes: We already had this flag, just named the opposite way. Not worth the breaking change to rename it. Though we are now enabling the flag by default.