Modify Disease Enum for Giardiasis case based surveillance

[KarnaiahPesula]

Feature Description

To begin the integration of Giardiasis disease (#13601) the first step will be:

Add new disease as Giardiasis in Disease enum.
Acceptance Criteria

• Update the Disease enum with the new disease as Giardiasis
• set the defaultCaseSurveillanceEnabled variable as true
• set primarydisease variable as true

Situation Description & Motivation

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High-Level Explanation

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Additional Information