bbox does not extend beyond ports in bends

[joamatab]

fixes #2134

@LuYouxi

[codecov]

Codecov Report

Merging #2154 (a87c575) into main (90116d6) will increase coverage by 0.01%.
The diff coverage is 94.73%.

@@            Coverage Diff             @@
##             main    #2154      +/-   ##
==========================================
+ Coverage   71.82%   71.84%   +0.01%     
==========================================
  Files         367      367              
  Lines       23052    23062      +10     
  Branches     3394     3394              
==========================================
+ Hits        16557    16568      +11     
+ Misses       5445     5444       -1     
  Partials     1050     1050              

Files	Coverage Δ
gdsfactory/components/bend_circular.py	100.00% <100.00%> (ø)
gdsfactory/components/bend_euler.py	72.41% <100.00%> (+0.64%)	⬆️
gdsfactory/components/straight.py	100.00% <100.00%> (ø)
gdsfactory/components/bend_circular_heater.py	96.77% <91.66%> (+4.77%)	⬆️

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[LuYouxi]

hi, I saw the modification of the straight waveguide and bend waveguide codes, but the offset parameter of bbox did not work, and the waveguide with bbox is still the same as version 7.8.0. I guess the implementation of add_bbox in cross_section should also be modified.