Error in scan result policy UI when selecting all license types

Summary

When configuring scan result policy of license_finding type, selecting all license types sets the policy yaml with invalid type resulting in schema validation failure.

Steps to reproduce

Go to Secure -> Policies
Create new policy -> Scan Result Policy
Select scan type to License Scan and click select all in License
Observe in policy yaml that license_types is populated as

- value: 
  text:

Example Project

What is the current bug behavior?

Policy YAML is populated as

- value: 
  text:

What is the expected correct behavior?

Policy YAML should be properly populated

Relevant logs and/or screenshots

Output of checks

Results of GitLab environment info

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(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)