Handle locked custom fields

Issue Summary

https://hello.atlassian.net/wiki/spaces/ACM/pages/2151415972/TWJMPT-63+Cannot+find+a+locked+custom+field+with+name+XXX+and+type+XXX

This is reproducible in Data Center: yes

Steps to Reproduce

1. Create a RapidView board
2. Go to configure board option on the top right
3. In the configuration section, go to estimation
4. Choose Original Story Points 

Expected Results

Migration should happen without locked customField - 

jpo-custom-field-original-story-points

Actual Results

The below exception is thrown in the xxxxxxx.log file:

Cannot find a locked custom field with name Original story points and type com.atlassian.jpo:jpo-custom-field-original-story-points...

Workaround

Currently, there is no known workaround for this behavior. A workaround will be added here when available.