chore: Migrate geo_st_difference_op operator to SQLGlot

[jialuoo]

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Fixes b/447388852 🦕

[jialuoo]

The ibis sql

SELECT
  st_difference(`t0`.`geography_col`, `t0`.`geography_col`) AS `geography_col`
FROM (
  SELECT
    `geography_col`
  FROM `bigframes-dev.sqlglot_test.scalar_types`
) AS `t0`

[tswast]

Thanks!