WIP(work in progress) OTT-225-269: Multiple commodity pages bug fix

[maverickvi]

WIP(work in progress): This ticket requires a total refactor of the sessions code and still needs to be done on Headings, Chapters, Subheadings. I was only able to do Commodities with the limited time I had before going on holiday.

Jira link

https://transformuk.atlassian.net/browse/OTT-225
https://transformuk.atlassian.net/browse/OTT-269

What?

I have added/removed/altered:

• used request referrer instead of sessions to fix country selection bug
• pass request referrer as a hidden field to fix date selection bug
• used request referrer in back links
• use request referrer in back to commodity links

Why?

I am doing this because:

• Sessions contained the wrong commodity code

[sentry-io]

Suspect Issues

This pull request was deployed and Sentry observed the following issues:

• ‼️ ActionView::Template::Error: No route matches {:action=>"show", :controller=>"headings", :id=>"8501535010"}, possible unmatche... GeographicalAreasController#show View Issue
• ‼️ ActionView::Template::Error: No route matches {:action=>"show", :controller=>"subheadings", :country=>"EG", :id=>"2933599590"}... TradingPartnersController#update View Issue
• ‼️ ActionView::Template::Error: No route matches {:action=>"show", :controller=>"subheadings", :id=>"8424499000", :measure_type_i... MeasureTypes::PreferenceCodesController#show View Issue
• ‼️ ActionView::Template::Error: No route matches {:action=>"show", :controller=>"subheadings", :id=>"6404199000"}, possible unmat... GeographicalAreasController#show View Issue
• ‼️ ActionView::Template::Error: No route matches {:action=>"show", :controller=>"headings", :id=>"6301100000", :measure_type_id=>... MeasureTypes::PreferenceCodesController#show View Issue

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