There are two issues addressed in this PR:

1. The request parameters included a deprecated parameter exclude_deleted. This parameter is popped out when doing the actual search on the metadata store now.
2. The metadata_type in the request parameter is received as string '300' which on conversion to json was turning it to list [3, 0, 0]. Since channels are removed, there is only one metadata type which is a single string, a simple integer conversion should be sufficient if the value is of string type.

Out of scope of this PR:

1. This PR does not address removing the deprecated parameter exclude_deleted from the remote search endpoint call from the GUI side.
2. Still the search query processing logic checks if the metadata_type is either an integer or list of integers. Since there is only one metadata type available, this logic should be changed. This change is out of scope for this PR.

Fixes #7893