CDMS-144 handle unmatched CHED

[limsim]

• Added scenario to test unmatched CHEDs.
• Updated README with instructions on how to set up test data.
• Made a couple of fixes.

[github-actions]

Package	Line Rate	Branch Rate	Health
Btms.Business	67%	48%	➖
Btms.Emf	11%	6%	❌
Btms.Types.Gvms.Mapping	38%	26%	❌
Btms.Metrics	85%	0%	✔
Btms.Types.Gvms	67%	100%	➖
Btms.Types.Alvs.Mapping	76%	0%	➖
Btms.Types.Ipaffs.Mapping	73%	30%	➖
TestDataGenerator	86%	74%	✔
Btms.Azure	43%	75%	❌
Btms.BlobService	44%	31%	❌
Btms.Backend	64%	47%	➖
Btms.Analytics	73%	61%	➖
Btms.Backend.Data	65%	61%	➖
Btms.Consumers	76%	67%	➖
Btms.Common	82%	0%	✔
Btms.Model	88%	80%	✔
Btms.SyncJob	73%	62%	➖
Btms.SensitiveData	80%	83%	✔
Btms.Types.Ipaffs	95%	61%	✔
Btms.Types.Alvs.Mapping.V1.Tests	0%	0%	❌
Btms.Types.Alvs	84%	67%	✔
Summary	74% (7223 / 9721)	50% (606 / 1210)	➖