Fix blue justification column header

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Current Behavior

The justification spreadsheet generated in the csv-output stage had a bug introduced when adding the banner for feature branch runs. When running a pipeline for a branch that isn't development or master, the header for the justification column is colorized along with the justifications.

Live Example

https://repo1.dso.mil/dsop/opensource/pipeline-test-project/java-code-evaluator/-/jobs/2846861 java-code-evaluator_0.1.0-227333-justifications.xlsx

Expected Behavior

The justification column header should not be affected by the colorized justifications.

Possible Solution

Update the loops in the colorize_*() functions in excel_convert.py to start at row 2 if the $CI_COMMIT_BRANCH isn't development or master.