[PCC] Added reusable UI elements for Bulky waste request form

[lucascumsille]

This PR includes elements that improves the user journey:

• Added secondary button, which has less emphasis than the primary one. It's good to use it next to the primary one so it
• Added a secondary button with less emphasis than the primary one. It's good to use it next to the primary one so it doesn't draw as much attention, but it's still fairly obvious is there. You can also use it on its own; when you want to show there is an action available but is not the most important part of the page.
• Added "Next" and "Back" buttons, which help with the page's scannability.
• Added an info message based on the GOVUK warning message. It can be used to provide non-vital information to the user, so if they decide to omit it, there won't be a big consequence. For example: "If you are a landlord, call this number". For instance, when NOT to use it, "You need to dismantle this item before collection". In this case, if the user ignores this message, there will be a consequence, the item won't get picked up.

Fixes: https://github.com/mysociety/societyworks/issues/3231

[codecov[bot]]

Codecov Report

Merging #4111 (5260dd4) into master (05b6d5c) will decrease coverage by 0.75%. The diff coverage is n/a.

:exclamation: Current head 5260dd4 differs from pull request most recent head 4a08747. Consider uploading reports for the commit 4a08747 to get more accurate results

@@            Coverage Diff             @@
##           master    #4111      +/-   ##
==========================================
- Coverage   82.93%   82.18%   -0.76%     
==========================================
  Files         368      368              
  Lines       25574    25886     +312     
  Branches     3885     3989     +104     
==========================================
+ Hits        21211    21275      +64     
- Misses       3174     3408     +234     
- Partials     1189     1203      +14     

Impacted Files	Coverage Δ
perllib/FixMyStreet/Roles/DDProcessor.pm	55.88% <0.00%> (-31.10%)	:arrow_down:
perllib/FixMyStreet/Cobrand/Oxfordshire.pm	62.31% <0.00%> (-20.41%)	:arrow_down:
perllib/FixMyStreet/Cobrand/Buckinghamshire.pm	72.05% <0.00%> (-13.11%)	:arrow_down:
web/cobrands/highwaysengland/assets.js	57.14% <0.00%> (-8.20%)	:arrow_down:
web/cobrands/merton/assets.js	85.71% <0.00%> (-5.20%)	:arrow_down:
perllib/FixMyStreet/DB/Result/Problem.pm	86.64% <0.00%> (-2.74%)	:arrow_down:
perllib/FixMyStreet/Cobrand/TfL.pm	83.98% <0.00%> (-0.75%)	:arrow_down:
web/cobrands/fixmystreet/assets.js	88.96% <0.00%> (-0.66%)	:arrow_down:
perllib/Open311.pm	93.72% <0.00%> (+1.65%)	:arrow_up:

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[lucascumsille]

@davea thanks again =) I just made both changes. Let me know if there is anything else you'd like me to change.

[lucascumsille]

Thanks @davea should I merge it? or wait for Victoria?

[nephila-nacrea]

Thanks @davea should I merge it? or wait for Victoria?

Should be OK to go ahead!