Remove xray_scan job from CI

What does this MR do and why?

As part of the epic X-Ray should not run as a CI job (&14100), we deprecated the X-Ray CI job and moved the X-Ray functionality into the monolith. It now runs as a background worker. This MR removes the (deprecrated) X-Ray CI job (xray_scan) and its configurations from .gitlab-ci.yml.

References

Related to #525639 (closed)

Screenshots or screen recordings

Before	After

How to set up and validate locally

For validation, as described in this comment, we can validate that the change successfully removes the job from running as

it's not running in the lint stage of the pipeline.

MR acceptance checklist

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