Fix CORS configs

- Use GithubClient inside GithubProtocolFetcherStrategy to improve readability and remove deplication.
- Use GithubService as a proxy for GithubClient in endpoint. This caches any values from the questionnaire.
- Created FunctionCache that caches the result of a throwing function for a given amount of time.
- Added more checks on the request being performed: number of bytes for content length, more strict URL validation (only https://api.github.com is allowed now instead of for example http://api.github.com.my.domain.

Cache questionnaires and standardize github client access

Sync release with dev

HTTP/1.1 does less connection sharing, causing the requests to go
through without connection resets.

In the previous handling of events, event were handled
immediately during the transaction, in the same thread. This caused a
lot of delays, blocking the database threads. The EventListener annotations are replaced by
TransactionalEventListener to ensure that the previous transaction has
been committed before processing the event. It explicitly creates
a new transaction to avoid overlapping transactions. Finally, it enables
async processing to avoid the existing transaction threads being blocked.

Remove unused spring-data-rest dependency

Use async processing to avoid database timeouts

Update release with latest changes