Improve MITRE ATT&CK Framework tab error handling

[mhamra]

Wazuh version	Install type	Action performed	Platform
v4.8.0-Beta1	Dashboard	MITRE ATT&CK Framework tab	Ubuntu 20.04

Description

When the indexer server is not working, the MITRE ATT&CK framework tab shows pop-up errors when the user presses the refresh button. Still, it doesn't alert the user that the indexer service is not working as expected.

The details of the screen and why this feature is requested can be found in this issue.

[AlexRuiz7]

MITRE framework details are fetched from the API, not from Indexer