Add healthy condition to source

[alonkeyval]

This pull request includes several changes to the frontend package, focusing on refactoring functions, improving code readability, and enhancing the condition handling for instrumented applications.

Refactoring and Code Simplification:

• Removed the mapping of instrumentation options in the instrumentedApplicationToActualSource function in frontend/graph/conversions.go to simplify the code.
• Changed the AutoInstrumentedDecision field to be an empty string in the instrumentedApplicationToActualSource function in frontend/graph/conversions.go.

Condition Handling Enhancements:

• Added a call to AddHealthyInstrumentationInstancesCondition in the K8sActualSources resolver in frontend/graph/schema.resolvers.go to ensure healthy instrumentation instances are tracked.
• Modified the GetActualSource function in frontend/services/sources.go to use AddHealthyInstrumentationInstancesCondition with a nil source parameter.
• Updated the addHealthyInstrumentationInstancesCondition function (renamed to AddHealthyInstrumentationInstancesCondition) in frontend/services/sources.go to use model.ConditionStatusTrue and model.ConditionStatusFalse instead of metav1.ConditionTrue and metav1.ConditionFalse, respectively. Also, added formatted message and transition time handling. [1] [2]

Utility Functions:

• Added a new utility function Metav1TimeToString in frontend/services/utils.go to convert metav1.Time to a string formatted in RFC3339.

Minor Code Improvements:

• Removed unnecessary comments in the Actions resolver in frontend/graph/schema.resolvers.go to improve code readability.
• Added the time package import in frontend/services/utils.go for date and time formatting.

[BenElferink]

😃