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Add coalesce node support for computed columns (#3552)

We invoke sys.tsql_get_expr function for getting the column definition in sys.computed_columns. At present tsql_get_expr function doesn't support Coalesce type in computed columns and return null when we try to obtain computed column expression containing Coalesce expression. Adding support for Coalesce node types for computed column expressions.

Task: Babel-5460

Signed-off-by: Sharath BP <sharatbp@amazon.com>
(cherry picked from commit ad1d76295)

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