Remove PipelineSecurityReportFinding name GraphQL field

Problem to solve

[BE] Add fields to the PipelineSecurityReportFinding GraphQL type adds a title field which is an alias for the current name field.

We deprecated name with #346335 (closed)

Now we need to remove this field.

According to deprecation process this issue should be scheduled only in major releases and more than 6 months since #346335 (closed) is implemented.

Proposal

1. Remove deprecated name field in PipelineSecurityReportFindingType.

Implementation plan

1. Remove field from ee/app/graphql/types/pipeline_security_report_finding_type.rb
2. Update specs
3. Update doc/api/graphql/removed_items.md