[FEA] Qualification tool: Add more information in output for Execs if there are unsupported Expressions

[nartal1]

Is your feature request related to a problem? Please describe.
The qualification csv output prints Execs as unsupported Execs if there are any expressions not supported within that Exec. In some instances, Execs are output in a row without mentioning any reason. We need to improve the output by providing more information in the rows that have Execs.

Example:

 "Exec" "Filter" ""
  "Exec" "Filter" "Filter Exec is not supported as expressions are not supported -  `AtLeastNNulls`"
  "Exec" "LocalTableScan" ""
  "Exec" "Project" ""
   "Exec" "Project" "Project Exec is not supported as expressions are not supported -  `to_date`"

In above Example, Filter and Project are not supported due to expressions not supported within them. But we also see rows that don't have expressions but Filter and Project are mentioned as not supported which can be confusing. We need to deduplicate the rows which do not have reasons for Execs and combine the output.

[mattahrens]

Idea: could we add a new column in the output that represents the duration % for the stage that the exec/expression was in? It wouldn't represent the exact duration for the individual unsupported operation, but knowing how much the stage with the unsupported operation took up compared to the overall job would be useful for prioritization.

Logic = stage duration (wall clock) / app duration (wall clock)