Introduce vitest to core/ecschema-metadata

[rschili]

Continuation of this effort: #7165

All remaining build errors are related to sinon or chai-as-promised, both of which need to be replaced by the respective vitest calls.

Current status:

Found 225 errors in 22 files.
Errors  Files

•     4  src/test/Context/SchemaCache.test.ts:29 (Fixed - Nam)
•     1  src/test/Context/SchemaContext.test.ts:43 (Fixed - Nam)
•     1  src/test/Deserialization/XmlParser.test.ts:2805 (Fixed - Nam)
•     3  src/test/Metadata/Class.test.ts:580 (Fixed - Nam)
•     5  src/test/Metadata/Constant.test.ts:140
•     1  src/test/Metadata/CustomAttributeClass.test.ts:70
•    12  src/test/Metadata/DelayedPromise.test.ts:11
•    34  src/test/Metadata/Deserialization.test.ts:84
•    19  src/test/Metadata/EntityClass.test.ts:331
•     4  src/test/Metadata/Enumeration.test.ts:227
•    22  src/test/Metadata/Format.test.ts:270
•     1  src/test/Metadata/InvertedUnit.test.ts:141
•     3  src/test/Metadata/KindOfQuantity.test.ts:114
•     6  src/test/Metadata/Mixin.test.ts:162
•     5  src/test/Metadata/Property.test.ts:164
•    19  src/test/Metadata/Relationship.test.ts:309
•     1  src/test/Metadata/RelationshipConstraint.test.ts:64
•     6  src/test/Metadata/Schema.test.ts:679
•     3  src/test/Metadata/SchemaFromJson.test.ts:94
•     9  src/test/Metadata/Unit.test.ts:145 (Fixed - Rob)
•    46  src/test/SchemaPartVisitorDelegate.test.ts:37
•    20  src/test/Validation/SchemaWalker.test.ts:137 (Fixed - Rob)

[rschili]

@hl662 is this the way to do it? This will call addSchema twice just to verify the message of the Error?