Kibana version: 7.11.1

Elasticsearch version: 7.11.1

Server OS version: ESS

Browser version: Version 88.0.4324.150 (Official Build) (x86_64)

Browser OS version: macOS Catalina 10.15.7

Original install method (e.g. download page, yum, from source, etc.): Elastic Cloud

Describe the bug:
It showed Policy "cloud-snapshot-policy" is already associated with this repository. when trying to create another SLM policy for found-snapshots repository which policy "cloud-snapshot-policy" is already associated with.

Steps to reproduce:

1. Create a deployment on Elastic Cloud (where SLM is enabled by default)
2. Create a policy from Snapshot and Store -> Policies -> Create a policy
3. Select default repository found-snapshots

Expected behavior:
It's working when using Put snapshot lifecycle policy API. It should be able to add another slm policy to repository found-snapshots
https://www.elastic.co/guide/en/elasticsearch/reference/master/slm-api-put-policy.html#slm-api-put-policy

Screenshots (if relevant):

Errors in browser console (if relevant):
N/A

Provide logs and/or server output (if relevant):
N/A

Any additional context: