Increase timeout of @url@ secrets fetching

Describe the bug

eval_secret has a fixed timeout of 5 seconds for @url@

vault-secrets-provider need to do up to 3 calls to login, check version and fetch the secret. So delay is multiplied.

Instead of putting 10 or 20 seconds everywhere, we should may be add a TBC_SECRET_URL_TIMEOUT variable

Expected behavior

@url@http://vault-secrets-provider/api/secrets/{secret_path}?field={field} should work even on slow networks when it could take more than 5 seconds.

Actual behavior

Wget timeout before request end

Context & Configuration

This issue applies to all templates with current eval_secret function. So it could be converted to an epic.

It is sent here as impacted user is only using it in docker template.