Remove work item type old ID fallback

Mario Celirequested to merge
520023-remove-fallback into master

What does this MR do and why?

We temporarily introduced a fallback mechanism as we cleaned up the IDs for work item types. In some instances where the IDs were not sequential, both values might not match. This change removes the fallback in favor of always using a sequential ID for work item types. Not adding DB changes to this MR as we might not even need to clean-up because of upcoming changes as discussed in #519894 (closed)

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Related to #520023 (closed)

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