WSTEAMA-1558 - Script switch refactor

[amoore108]

Resolves JIRA https://jira.dev.bbc.co.uk/browse/WSTEAMA-1558

Overall changes

• Refactors the Script switch button to remove scriptSwitchId logic, as well as logic tied to react-router-dom
• This also allows the script switch button to be rendered in the Next.js app
• Hides the script switch button on variant service topic pages for now as the back-end does not fully support transliterated topic pages end-to-end

Code changes

• Refactors <ScriptLink /> component to simplify variant switching
• Updates tests to reflect simpler implementation
• Removes path-to-regexp library

Testing

1. Visit http://localhost:7080/serbian/cyr/srbija-68707945?renderer_env=live
2. Hover over the script switch button and confirm the url changes cyr to lat
3. Click the link and confirm it takes you to the correct transliterated article (you will need to re-add ?renderer_env=live)
4. Visit http://localhost:7080/serbian/cyr/srbija-68707945.amp?renderer_env=live
5. Repeat the steps above for AMP (the link will have .amp removed, this is expected behaviour)
6. Visit http://localhost:7080/serbian/cyr/srbija-68707945.lite?renderer_env=live
7. Repeat the steps above for Lite
8. Visit http://localhost:7080/serbian/cyr?renderer_env=live
9. Hover over the script switch button and confirm the url changes cyr to lat
10. Click the link and confirm it takes you to the correct transliterated homepage (you will need to re-add ?renderer_env=live)
11. Visit http://localhost:7080/serbian/articles/cy9j40v4n75o/cyr?renderer_env=live
12. Hover over the script switch button and confirm the url changes cyr to lat
13. Click the link and confirm it takes you to the correct transliterated article (you will need to re-add ?renderer_env=live)
14. Visit http://localhost:7080/serbian/lat/topics/c06g87137jgt?renderer_env=live
15. Confirm the script switch button is not displayed

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