Remove pipeline association from Vulnerabilities::Finding

Subashis Chakrabortyrequested to merge
338665-code-cleanup into master

What does this MR do and why?

We are using pipeline association from Vulnerabilities::Finding only for specs after this !70216 (merged). See the comment here. This MR removes this association by fixing specs.

Related to #338665 (closed)

Edited by Subashis Chakraborty

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