[BUG] Audit expression name and SQL function name in supportedExprs.csv

[nartal1]

Describe the bug
SQL functions which are supported in Spark-Rapids are classified as unsupported expressions due to current technique of identifying unsupported expressions. Currently we take Expression column and SQL func column from supportedExprs.csv and remove _ for SQL_func ( as for almost all expressions, expression name and SQL functions are same when _ is removed Ex: ArrayExcept -> array_except).
But there are some exceptions (First -> first, first_value), we need to preserve_ for those SQL functions where Expression name and SQL_func name is different. Found an issue with this here - #381

We need to audit supportExprs.csv to go over whole list to make sure we cover all the expressions where Expression name is different from SQL function name.

Expected behavior
Supported expressions should not displayed in unsupportedExpressions column

Environment details (please complete the following information)
Onprem, all CSP's

Additional context
Add any other context about the problem here.

[nartal1]

This isn't required anymore as we are searching for both Expression name and SQL function name(s) in this PR - #408 . Closing this.