Clean up enum and constant naming conventions

[ckbedwell]

Problem

Throughout the Synthetic Monitoring app code enums and constants have inconsistent naming conventions.

Completion criteria

Convert all enums and constants throughout the code base to have a consistent naming convention.

Reference comment by @w1kman

// Bad 
enum AM_I_A_CONST_OR_A_ENUM {
  FOO,
  BAR,
}

// Bad 🤨
enum AM_I_A_CONST_OR_A_ENUM {
  Foo,
  Bar,
}

// Bad 🤨
enum AlmostAnEnum {
  FOO,
  BAR,
}

// Good 💖
enum ClearlyAnEnum {
  Foo,
  Bar,
}