IGVF-DACC / igvf-ui / #6270

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IGVF-2791 Cache module rewrite and persistent backend connection (#890)

* Fix a Typescript conflict that was bothering me.
* Rewrite Redis caching mechanism for simplicity and for protecting the backend against stampeding when the cache expires. Rewrite two cache users to use the new mechanism.
* Cache the home-page statistics and chart data with the new caching mechanism.
* Have the indexer-state API use the new caching mechanism, making this the last usage of the old caching mechanism to update.
* Rewrite caching Jest tests to use the new module API.
* If cookies are unavailable (common in Cypress tests), continue with the cached fetch as we did with the previous caching mechanism, just without the cookie.
* Restore full Jest coverage.
* Fix 308 response from a bad URL when requesting `/api/profiles`.
* Add trailing slashes to /api endpoints to avoid 308 redirects.
* Add persistent TCP/TLS connections between our Next.js server and the backend server.
* Get full Jest coverage with the persistent connection changes.
* Move needed types from `fetch-request.d.ts` to `fetch-request.ts`. Remove FETCH_METHOD and instead use a union type.
* Clean up the fetch-request and session-context types files as well as their usage.
* Redis client is actually asynchronous.
* Add a `getCachedData()` function, and rename the old one to `getCachedDataFetch()`. Finish the rewrite of the cache module API documentation.
* Update the documentation for the cache module.
* Update an outdated import file name.
* Revert removal of cookie property from indexer-info requests.
* Corrections from Copilot code review. Added a comment warning to avoid modifying `HttpsAgent` and `HttpAgent`. Avoid a typecast for `RequestInit` objects. Remove hardcoded constants. Corrected a grammar error.
* Cleaned up the last changes I made to indexer-state.
* Fix a missing type in a FetchRequest method.
* Fix async calls with `mockReturnValue` to use `mockResolvedValue` instead.

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