[CI] See if upstream is in drone env var

[aHenryJard]

Proposed changes

• if a branch starts with opencti/* takes both branch and upstream from PR context.

Related issues

• CI on features that requires both opencti and client-python is not working with forks

Checklist

• I consider the submitted work as finished
• I tested the code for its functionality
• I wrote test cases for the relevant uses case
• I added/update the relevant documentation (either on github or on notion)
• Where necessary I refactored code to improve the overall quality

Further comments

If this is a relatively large or complex change, kick off the discussion by explaining why you chose the solution you did and what alternatives you considered, etc...