Dinosaur conftest refactor to support AuthPolicy v2

[azgabur]

Resulting AuthConfig is almost identical to currently used dinosaur_config.yaml with few exceptions:

• New AuthConfig contains credentials.authorizationHeader.prefix: Bearer in both oidc identity providers objects which is automatically added by testsuite while old AuthConfig has empty credentials object.
• In new AuthConfig metadata.http.<name>.contentType has value application/x-www-form-urlencoded and in headers it specifies the contentType application/json while old AuthConfig has contentType value set to application/json
• I removed debugging responses headers denoted as "TMP" in old dinosaur_config.yaml

This PR implements ttl functionality in add oidc identity function. Testing case for this new feature will be done #314