feat: Branch dropdown search merged + unmerged branches

[scott-codecov]

The API returns only unmerged branches by default which is nice in that it keeps the branch selector fairly tidy and relevant to current work. When we're searching for a specific branch we'd like to search across merged branches as well. This passes the necessary GraphQL resolver filter in that case.

From codecov/codecov-api#96

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[codecov-staging]

Codecov Report

Merging #2251 (00abff3) into main (3de912a) will increase coverage by 0.00%.
The diff coverage is 100.00%.

@@           Coverage Diff           @@
##             main    #2251   +/-   ##
=======================================
  Coverage   97.94%   97.94%           
=======================================
  Files         698      698           
  Lines        7931     7936    +5     
  Branches     1886     1890    +4     
=======================================
+ Hits         7768     7773    +5     
  Misses        161      161           
  Partials        2        2           

Files Changed	Coverage
src/services/branches/useBranches.js	100.00%

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[codecov]

Codecov Report

Merging #2251 (00abff3) into main (3de912a) will increase coverage by 0.01%.
The diff coverage is 100.00%.

@@           Coverage Diff           @@
##            main   #2251     +/-   ##
=======================================
+ Coverage   97.94   97.95   +0.01     
=======================================
  Files        698     698             
  Lines       7931    7936      +5     
  Branches    1886    1890      +4     
=======================================
+ Hits        7768    7773      +5     
  Misses       161     161             
  Partials       2       2             

Files Changed	Coverage Δ
src/services/branches/useBranches.js	100.00% <100.00%> (ø)

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