Cadence and iteration related data in dashboards is missing after import

Summary

When importing data for

Steps to reproduce

1. Create a group with Issue dashboard, cadences and few issues
2. Export the group
3. Import the group or Transfer the group

Example Project

Note that https://about.gitlab.com/handbook/product/ux/ux-research/ux-cloud-sandbox/ was used

• Parent project: https://ux.gitlabdemo.cloud/groups/dteverovsky-group/plan-benchmark-test/-/boards/307
• Example transferred project - https://ux.gitlabdemo.cloud/groups/ux_test/transfer_test/plan-benchmark-test/-/boards/1119

What is the current bug behavior?

Dashboard filters and lists with Iterations are missing after transfer/import

What is the expected correct behavior?

Dashboard filters and lists with Iterations are imported correctly

Relevant logs and/or screenshots

screenshot

Output of checks

Results of GitLab environment info

Expand for output related to GitLab environment info

(For installations with omnibus-gitlab package run and paste the output of:
`sudo gitlab-rake gitlab:env:info`)

(For installations from source run and paste the output of:
`sudo -u git -H bundle exec rake gitlab:env:info RAILS_ENV=production`)

Results of GitLab application Check

Expand for output related to the GitLab application check

(For installations with omnibus-gitlab package run and paste the output of:
sudo gitlab-rake gitlab:check SANITIZE=true)
(For installations from source run and paste the output of:
sudo -u git -H bundle exec rake gitlab:check RAILS_ENV=production SANITIZE=true)
(we will only investigate if the tests are passing)

Possible fixes