feat(severityNone): Implement Identification of Issue Matches of Severity None

[lolaapenna]

Task Description
Currently issue matches with severity value none are aggregated with issue matches of all severity levels. We need to implement a segregation of those with severity value none so that they do not appear in as issues in the service detail view.

Acceptance Criteria:

• Default filter selection for All Severities but None
• Issues in the service detail view does not include those with severity None

Expected Test:
Add any information about how this will be tested.

[lolaapenna]

Changes will be implemented on the API first before UI.

[hodanoori]

To prevent misleading users, componentInstanceCount and issueMatchCount for the Services view should be calculated separately for each severity level in the API. These counts will then be displayed with distinct icons in the corresponding count column on the Services main list view.