Fix timeout error when loading pipelines by commit SHA for GraphQL

What does this MR do?

In https://gitlab.com/gitlab-org/gitlab/-/blob/409ada30e7100a944b9758d4a95cb24637ecfef2/app/graphql/resolvers/project_pipeline_resolver.rb#L34 we are calling Ci::PipelinesFinder with shas: shas, but the finder expects sha instead: https://gitlab.com/gitlab-org/gitlab/-/blob/409ada30e7100a944b9758d4a95cb24637ecfef2/app/finders/ci/pipelines_finder.rb#L101-107. Because of this it tries to load all the pipelines for the given project, resulting in database timeouts.

https://log.gprd.gitlab.net/app/discover#/doc/97f04200-024b-11eb-81e5-155ba78758d4/pubsub-postgres-inf-gprd-000325?id=J4vyxHgB_Tc-7m8c8ZuU

Problematic query:

SELECT "ci_pipelines".* FROM "ci_pipelines" WHERE "ci_pipelines"."project_id" = $1 AND "ci_pipelines"."source" != $2 ORDER BY "ci_pipelines"."id" DESC

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