Redirect to request when there is a processing request

What does this mr do?

When people who have a processing request try to access the lab page, this will be forwarded to their request for this lab instead.

Screenshots

before

after

Does this MR meet the acceptance criteria?

• I have added a changelog entry to reflect the significant changes I made.
• Tests were created to test the feature.
• I have updated the documentation accordingly.
• I adhere to the style guide.