Add directive to follow redirects for WG and FDNDB API clients

This was causing issues with fetching working-groups as it was getting redirected. To prevent future problems like this, we should follow redirects on internal APIs to do our best to handle slight shifts in the API.

Additionally, update to WG endpoint to add trailing slash to avoid unnecessary future redirects.

assigned to @cguindon and @zacharysabourin

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merged

mentioned in commit 8ef374ea