[WEB-4294] Persist language choice across pages

[jamiehenson]

Unblocks #2497.

Core addition here is the removal of the logic that redirects to a present language if the currently selected language is not in the list of languages supported by the viewed docs entry.

Bot summary:
This pull request refactors the code to replace the usage of PageLanguageContext with the new LayoutContext. The changes involve updating various components and tests to utilize the new context. Here are the most important changes:

Context Replacement:

• src/components/LanguageButton/LanguageButton.tsx: Replaced usePageLanguage with useLayoutContext to manage language state.
• src/components/Layout/utils/nav.ts: Updated the ActivePage type and determineActivePage function to include the new language context. [1][2][3]
• src/components/Link/LanguageLink.tsx: Replaced usePageLanguage with useLayoutContext for language handling.
• src/components/Menu/LanguageNavigation/LanguageNavigation.tsx: Updated to use useLayoutContext instead of usePageLanguage. [1][2][3]

Test Updates:

• src/components/LanguageButton/LanguageButton.test.tsx: Replaced PageLanguageContext with LayoutProvider in tests. [1][2][3][4]
• src/components/blocks/Html/Html.test.tsx: Updated tests to use LayoutProvider instead of PageLanguageContext.
• src/components/blocks/software/Pre.test.tsx: Modified tests to use LayoutProvider for context. [1][2][3][4]

Component Updates:

• src/components/blocks/Html/LinkableHtmlBlock.js: Replaced usePageLanguage with useLayoutContext for language checks.
• src/components/blocks/api-reference/dividers/ApiReferenceDiv.tsx: Updated to use useLayoutContext for language matching. [1][2]
• src/components/blocks/api-reference/dividers/ApiReferenceSpan.tsx: Replaced usePageLanguage with useLayoutContext for language checks.
• src/components/blocks/list/Dl/DlWrapper.tsx: Updated to use useLayoutContext instead of usePageLanguage.

These changes ensure that the new LayoutContext is consistently used across the codebase, replacing the old PageLanguageContext.

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[m-hulbert]

LGTM!

[kennethkalmer]

Is there is a simple flow for me to test this, just to make sure my tired brain marries the code with the behaviour?

[jamiehenson]

@kennethkalmer Matt's gif is probs the best test for it (https://ably-real-time.slack.com/archives/C01LR5XFHFX/p1743120911961429)

[kennethkalmer]

It just dawned on me that gif is in #2497 as well 🤦

[kennethkalmer]

Works nicely @jamiehenson