fix: handle GitHub API error responses in GetXrayVersions (#3609)

GitHub API returns JSON object instead of array when encountering errors
(e.g., rate limit exceeded). This causes JSON unmarshal error:
'cannot unmarshal object into Go value of type []service.Release'

Add HTTP status code check to handle error responses gracefully and
return user-friendly error messages instead of JSON parsing errors.

Fixes issue where getXrayVersion fails with unmarshal error when
GitHub API rate limit is exceeded.

0 files changed, 0 insertions, 0 deletions