Remove security body issue body and related

Lorenz van Herwaardenrequested to merge
438235-fe-cleanup-8 into master

What does this MR do and why?

There are a couple components, like blocking_merge_requests_report.vue which include a <report-section /> where the component prop defines which component of issue_body.js is used. However, there is no place where the <report-section /> is included with component set to "SecurityIssueBody". So security_issue_body.vue and related unused components/constants can be removed.

Actually, MetricsReportsIssueBody and PerformanceIssueBody are also unused, so I'll remove them in a follow-up MR.

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Related to #438235 (closed)

Edited by Lorenz van Herwaarden

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