feat: [CDS-89581]: Incorrect yaml generated for failure strategy

[ayushitiwari024]

Issue: RetryInterval is not marked as a mandatory field which throws up an error later during plan creation.

fix: Added a schema validation to mark retryCount, retryIntervals and Post retry strategies as mandatory fields

Testing:

1. Passed an empty array in retryIntervals

2. Passed an empty string in an array of retryIntervals

3. Passed empty string as an array 4. Passed an empty array all together 5. removed post retry failure strategies 6. Didn't provide retryIntervals 7. Didn't provide retryCounts

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