Add Related Careers functionality to EventDefinition entity and update related components

Introduced a many-to-many relationship between EventDefinition and Career entities, allowing for the association of multiple careers with an event. Updated the AppDbContext to include a DbSet for Careers and modified the EventDefinitionConfiguration to handle the new relationship. Enhanced the Create, Edit, and Details components to support input and display of related careers, including normalization and processing logic for career names. Updated the database schema to reflect these changes.

Core/Entities/Career.cs

@@ -0,0 +1,19 @@
+using System.ComponentModel.DataAnnotations;
+
+namespace Core.Entities;
+
+public class Career
+{
+	public int Id { get; set; }
+
+	[Required]
+	[StringLength(200, MinimumLength = 1)]
+	[Display(Name = "Career Name")]
+	public string Name { get; set; } = null!;
+
+	public override string ToString()
+	{
+		return Name;
+	}
+}
+

Core/Entities/EventDefinition.cs

@@ -79,6 +79,11 @@ public class EventDefinition
     public string? Description { get; set; }
 	public int? LevelOfEffort { get; set; }
 
+	public ICollection<Career> RelatedCareers { get; set; } = new List<Career>();
+
+	[System.ComponentModel.DataAnnotations.Schema.NotMapped]
+	public string? RelatedCareersText { get; set; }
+
 	public override string ToString()
 	{
 		return Name;