Export operation fails to parse _typeFilter with OR search expression

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**Describe the bug**
When trying to `$export` data using a `_typeFilter` which contains an OR search expression, the `The _typeFilter segment '{0}' could not be parsed.` error is returned.

E.g. when `_typeFilter` contains the 2 expressions below (separated with a comma):
```http
GET /Observation?combo-code=sys1|code1,sys2|code2
GET /Patient?_has:Observation:patient:combo-code=sys1|code1,sys2|code2
```

**FHIR Version?**
Stu3/R4/R5

**Data provider?**
CosmosDB/SQL Server

**To Reproduce**
Steps to reproduce the behavior:
1. Start export operation
```http
GET /$export?_type=Patient,Observation&_typeFilter=Observation?combo-code=sys1|code1,sys2|code2,Patient?_has:Observation:patient:combo-code=sys1|code1,sys2|code2
```

**Expected behavior**
Export operation successfully started, and resources matching either of the queries are exported.

**Actual behavior**
Request fails with `400 Bad Request` with a message: `The _typeFilter segment '{0}' could not be parsed.`

**Fix suggestion**
Relevant source: [src/Microsoft.Health.Fhir.Core/Features/Operations/Export/CreateExportRequestHandler.cs#L119-L157](https://github.com/microsoft/fhir-server/blob/main/src/Microsoft.Health.Fhir.Core/Features/Operations/Export/CreateExportRequestHandler.cs#L119-L157)

```javascript
// This is TypeScript, just to illustrate the idea
const typeFilter: string[] = [];
if (typeFilterCsv) {
let queryStart = 0;
let lastComma = -1;
for (let i = 0; i < typeFilterCsv.length; i++) {
const char = typeFilterCsv[i];
if (char == ',') {
lastComma = i;
} else if (char == '?') {
if (lastComma == -1) {
continue;
}

const query = typeFilterCsv.substring(queryStart, lastComma);
typeFilter.push(query);

queryStart = lastComma + 1;
} else {
continue;
}
}

const query = typeFilterCsv.substring(queryStart);
typeFilter.push(query);
}
```

Start in src/Microsoft.Health.Fhir.Core/Features/Operations/Export/CreateExportRequestHandler.cs around lines 119-157 and trace how _typeFilter segments are split. Reproduce the supplied $export request with comma-separated OR expressions, then verify that the operation starts successfully and accepts both resource queries.

Written by the indexing model from the issue text.