fix(crawler): RoleRef should extract ARN

[wotolom]

Description of your changes

Adds line to extract ARN from Role to be used for Crawler

I miss of my part, when I enhanced the Glue service here.

Role reference for the resource Crawler should use the ARN:

1. for consistency -> same as the Glue resource Job
2. with ARN through refs, users don't have to think about possible path, if other fields only take ARN

I have:

• Read and followed Crossplane's [contribution process].
• Run make reviewable test to ensure this PR is ready for review.

How has this code been tested

Manually with the relating example.

[haarchri]

@wotolom can you fix lint ?

[wotolom]

@haarchri no, it seems again - like for batch PR - to be a simple timeout error. Can you re-run the lint-check? That eventually worked in the other mentioned PR.

[haarchri]

LGTM