Remove columns from the requirements table

What does this MR do and why?

This MR removes ignored fields that are no longer be supported on requirements model.

Based on: #358976 (closed)

Following the avoiding downtime in migrations documentation, the following steps are:

• Step 1: Ignore unused columns on requirements (!97183 - merged)

• Step 2: HERE WE ARE

• Step 3: #433241 (closed)

Screenshots or screen recordings

N/A

How to set up and validate locally

N/A

MR acceptance checklist

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• I have evaluated the MR acceptance checklist for this MR.