[PROMOTE TO BLOCKING] Create Multiple file snippet creates a personal sn

What does this MR do?

Promotes the test Create Multiple file snippet creates a personal snippet with multiple files to the blocking bucket

This test was identified in the reliable e2e test report: #450376 (closed)

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(This MR was automatically generated by gitlab_quality-test_tooling at 2024-03-14 18:07:03 UTC)