refactor: 💡 Auth refactor

[angarita-dev]

Why?

• changes provider hierarchy to expose logout to UrqlClient (fixes PLAT-354)
• changes logout behavior to correctly logout dynamic, accessToken & perform redirect to login (fixes PLAT-1823)
• changes responsibility of AuthProvider
• pause initial queries that have authentication required
• handles correct pending projectId queries for logged in user (url /projects/[projectId]/..., useful when linking from generic contexts (blog)
• de-couples posthog & identifier, allowing us to set the posthog provider higher (unlink on logout) & identifies the user further below the providers when UrqlClient context is available.
• changes projectId cookie to lastProjectId

How?

• Based off analogue PR to previous repository, although with less implications / things changing at the same time.

Tickets?

• Ticket 1
• Ticket 2
• Ticket 3

Contribution checklist?

• The commit messages are detailed
• The build command runs locally
• Assets or static content are linked and stored in the project
• You've reviewed spelling using a grammar checker
• For documentation, guides or references, you've tested the commands and steps
• You've done enough research before writing

Security checklist?

• Sensitive data has been identified and is being protected properly
• Injection has been prevented (parameterized queries, no eval or system calls)
• The Components are escaping output (to prevent XSS)

References?

Optionally, provide references such as links

Preview?

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