[Northumberland] add DVLA lookup for abandoned vehicles

[struan]

Adds DVLA lookup to Northumberland.

As the only have a single text field for the relevant categories this adds in the option to put a single summary with all the DVLA information in a single field.

[skip changelog]

Fixes mysociety/societyworks#5497

[codecov]

Codecov Report

❌ Patch coverage is 73.33333% with 4 lines in your changes missing coverage. Please review.
✅ Project coverage is 83.42%. Comparing base (b33e2fb) to head (dc9f79b).
⚠️ Report is 4 commits behind head on master.

Files with missing lines	Patch %	Lines
web/cobrands/fixmystreet-uk-councils/dvla.js	73.33%	4 Missing ⚠️

Additional details and impacted files

@@            Coverage Diff             @@
##           master    #5957      +/-   ##
==========================================
+ Coverage   83.40%   83.42%   +0.02%     
==========================================
  Files         500      500              
  Lines       37282    37535     +253     
  Branches     6157     6234      +77     
==========================================
+ Hits        31094    31314     +220     
- Misses       4382     4406      +24     
- Partials     1806     1815       +9     

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