Port breakpoint-related changes from Chromium's v8 #108
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This should address https://linear.app/replay/issue/PRO-1475/missing-breakpoint-locations-in-node-recordings-in-the-for-ofs-head because this PR deduplicates breakpoints added to the same source position (as it ports replayio/chromium-v8#189 )
In addition to that, to make the port easier~ (we touched related places in a couple of the most recent PRs) I decided to port those PRs too:
replayio/chromium-v8#267
replayio/chromium-v8#268
replayio/chromium-v8#214
replayio/chromium-v8#269