DEV: Fix flaky tests report artifacts not using the right job_id (#24939)

Why this change?

`github.job` returns the `job_id` per the docs but it doesn't actually
return the id of the job but instead returns the job's name strangely.

Per https://github.com/orgs/community/discussions/8945, there is no way
to get the `job_id` from the existing contexts in the actions run.
Therefore, we have to hit Github's API to fetch it. Not ideal but no
way around this.

script/get_github_workflow_run_job_id.rb

@@ -0,0 +1,30 @@
+#!/usr/bin/env ruby
+# frozen_string_literal: true
+
+require "net/http"
+require "json"
+
+workflow_run_id = ARGV[0]
+run_attempt = ARGV[1]
+job_name = ARGV[2]
+
+uri =
+  URI.parse(
+    "https://api.github.com/repos/discourse/discourse/actions/runs/#{workflow_run_id}/attempts/#{run_attempt}/jobs",
+  )
+
+request = Net::HTTP::Get.new(uri)
+request["Accept"] = "application/vnd.github+json"
+request["X-Github-Api-Version"] = "2022-11-28"
+
+response =
+  Net::HTTP.start(uri.host, uri.port, use_ssl: uri.is_a?(URI::HTTPS)) do |http|
+    http.request(request)
+  end
+
+JSON.parse(response.body)["jobs"].each do |job|
+  if job["name"] == job_name
+    puts job["id"]
+    break
+  end
+end