[flang] Remove materialization workaround in type converter (#98743) This change is in preparation of #97903, which adds extra checks for materializations: it is now enforced that they produce an SSA value of the correct type, so the current workaround no longer works. The original workaround avoided target materializations by directly returning the to-be-converted SSA value from the materialization callback. This can be avoided by initializing the lowering patterns that insert the materializations without a type converter. For `cg::XEmboxOp`, the existing workaround that skips `unrealized_conversion_cast` ops is still in place. Also remove the lowering pattern for `unrealized_conversion_cast`. This pattern has no effect because `unrealized_conversion_cast` ops that are inserted by the dialect conversion framework are never matched by the pattern driver.
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