Add "Connectors" indicator and filter option to Integrations page

[rseldner]

Describe the feature:
Provide a "Search Connectors" indicator and filter options in the Integrations page

Describe a specific use case for the feature:

Currently, the Integrations page displays integrations that can be used with elastic agent (as package policies), beats, AND Search Connectors (formerly Enterprise Search). However, the Connectors are not filterable, and filtering on either beats or elastic-agent has no effect on removing these connectors. There is also no explicit indicator for which are Connectors.
This can give the user the impression that a connector is available to use with beats and/or elastic agent.

Using Salesforce Integrations as an example:

Additional points of confusion:

• The Connectors in the Integration page are not in the Integrations docs: https://www.elastic.co/docs/current/integrations/salesforce
• They are documented in Enterprise Search docs: https://www.elastic.co/guide/en/enterprise-search/current/connectors-salesforce.html
• This becomes even more confusing if a Fleet user, starting from the fleet UI, is in a Kibana Space that does not have Search enabled.
  • Video showing this:

Kapture.2024-10-28.at.14.35.36.webm