Add support for GL Access Tokens
This is a temporary change that will add support for both GL Access tokens and GL Observability UI tokens in the agentk. The goal is to switch to GL access tokens.
Once it gets deployed, we need to update the data in consul (see this MR for context) with the GL token, and then change the code again to support only GL Tokens.
Relates to gitlab-org/opstrace/opstrace#2148 (closed)