Update cookie policy

[louise-davies]

Description

We now have more first party cookies/local storage items, and to make it easier to maintain I'm using an array in the translation file to manage the list of essential cookies/local storage items.

I also removed the references to TopCAT & added a line that the site won't work if you block cookies at the browser level etc.

Testing instructions

Add a set up instructions describing how the reviewer should test the code

• Review code
• Check Actions build
• Review changes to test coverage

Agile board tracking

Part of #98

[codecov]

Codecov Report

Merging #1089 (5988488) into develop (9d5c7a5) will increase coverage by 0.01%.
The diff coverage is 100.00%.

@@             Coverage Diff             @@
##           develop    #1089      +/-   ##
===========================================
+ Coverage    97.95%   97.97%   +0.01%     
===========================================
  Files           42       42              
  Lines         1565     1578      +13     
  Branches       420      422       +2     
===========================================
+ Hits          1533     1546      +13     
  Misses          31       31              
  Partials         1        1              

Impacted Files	Coverage Δ
src/cookieConsent/cookiesPage.component.tsx	100.00% <100.00%> (ø)
src/state/scigateway.types.tsx	100.00% <0.00%> (ø)
src/state/reducers/scigateway.reducer.tsx	100.00% <0.00%> (ø)
src/state/middleware/scigateway.middleware.tsx	93.23% <0.00%> (ø)
src/state/actions/scigateway.actions.tsx	98.18% <0.00%> (+0.03%)	⬆️
src/theming.tsx	97.05% <0.00%> (+0.39%)	⬆️

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[sam-glendenning]

I just made a couple of tiny changes that I think improve the wording a little but apart from that I'm happy with it. Best wait on Alejandra for her thoughts though

[louise-davies]

I just confirmed with Alejandra re: these changes in our catchup so I'll go ahead and merge them