TEST: open issue with labels and milestone

[mevdschee]

This is a TEST issue used as a fixture for the exporter end-to-end test suite.

It exercises:

• labels
• milestone
• a comment thread
• closing the issue

[mevdschee]

TEST comment: this is a fixture comment used to verify the exporter writes comments correctly.

[mevdschee]

TEST comment 2: second fixture comment, used to verify multiple comments are preserved in order.