Ignore environment validation failure

What does this MR do?

This patch will allow users to create pipelines even if it contains invalid environment name.

This is an important patch for those critical issues. https://gitlab.com/gitlab-org/gitlab-ce/issues/53979 https://gitlab.com/gitlab-org/gitlab-ce/issues/54028

What are the relevant issue numbers?

Does this MR meet the acceptance criteria?

• Changelog entry added, if necessary
• [-] Documentation created/updated
• Tests added for this feature/bug
• Conforms to the code review guidelines
• Conforms to the merge request performance guidelines
• Conforms to the style guides
• Conforms to the database guides
• [-] Link to e2e tests MR added if this MR has Requires e2e tests label. See the Test Planning Process.