feat: validate that monitors are configured for single retry only [sc-24878]

[sorccu]

This PR adds validation to make sure that monitors only use retry strategies they support.

A similar change is implemented for CheckGroups and Checks. Without delving too deep into the types, the following snippet should give you the general idea:

export type MonitorRetryStrategy =
  | SingleRetryStrategy
  | NoRetriesRetryStrategy

export type CheckRetryStrategy =
  | LinearRetryStrategy
  | ExponentialRetryStrategy
  | FixedRetryStrategy
  | SingleRetryStrategy
  | NoRetriesRetryStrategy

export type GroupRetryStrategy =
  | CheckRetryStrategy
  | MonitorRetryStrategy

The RetryStrategyBuilder has been updated to return compatible structs.

All of these changes are backwards compatible with the following exceptions:

1. Using extra properties on a retry strategy (think maxRetries when type: 'NO_RETRIES') will now result in a compilation error. Therefore, if a user had used an invalid combination before, that will now fail (depending on the TypeScript loader type - jiti will not error).
2. The recently released monitors will no longer support most retry strategies.
   • This also means that if an incompatible default retryStrategy has been specified in the Checkly config file, the user will now get a validation error on deploy/test/etc.

Affected Components

• CLI
• Create CLI
• Test
• Docs
• Examples
• Other

Notes for the Reviewer

Resolves #[issue-number]

New Dependency Submission