Add setting to manage policy templates behavior in Kibana

[mrodm]

What does this PR do?

Adds a new setting policy_templates_behavior to manage how the policy templates / tiles are shown to the user in Kibana.

Values that admit this new field:

• combined_policy
• individual_policies
• all

Why is it important?

There are some integrations that do not require to show a tile for the integration itself, or vice-versa, there could be integrations that it is not desired to show each of the policy templates (child policy templates) defined as tiles, just the one referring to the integration itself (parent tile)

Checklist

• [x] I have added test packages to test/packages that prove my change is effective.
• [x] I have added an entry in spec/changelog.yml.

Related issues

• Closes #802

[elasticmachine]

:green_heart: Build Succeeded

• Buildkite Build
• Commit: b2ff18906289256c01d80e8e585175bf433e92d5

History

• :green_heart: Build #876 succeeded 8a1f8e935fcdfc042a64d2fec13f29a7c7d75971
• :green_heart: Build #875 succeeded 0b8c6e2e5274d07684ab152c63aed38ce936c26a
• :broken_heart: Build #874 failed c4a52909957507733fd4c1ee3b0cf834b1341a15
• :green_heart: Build #873 succeeded dca0eefbf373a2249cf87f883d1316e5dc7cadf6
• :green_heart: Build #872 succeeded f84211b5fb3eb1d8cc8e3580588584888f92ed79
• :green_heart: Build #871 succeeded c0d11656493af81597f26b019a7e34e16ae949d9

cc @mrodm