[Unity][Doc] Document passes that depend on DataflowBlocks and encourage using ConvertToDataflow
#16514
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Many Relax passes that rely on dataflow blocks do not explicitly state that they do. This is relevant for the phase ordering, since
ToNonDataflowis eventually used. Additionally, if a user did not manually insert dataflow blocks, the passConvertToDataflowcan be used to automatically extract dataflow blocks. This PR adds doc comments for passes that do depend on DF blocks and also adds notes suggesting the use ofConvertToDataflowto ensure that there will be DF blocks for these passes (if applicable).