Remove duplicate tests for aggregate functions, aggregate queries, and arithmetic functions

[antvaset]

This PR removes CQL library-based tests for CQL expressions in favour of XML-based tests. All library tests that are not present in XML are moved to XML.

This is a continuation of https://github.com/cqframework/clinical_quality_language/pull/1383 and addresses https://github.com/cqframework/clinical_quality_language/issues/1376.

The following library tests needed to be modified when moved to XML: 1) CqlArithmeticFunctionsTest/Exp/Exp1Long - changed the expression from Exp(1L) to Round(Exp(1L), 8) (also changed the name to Exp1L). Fixing the precision makes the test more robust and consistent with CqlArithmeticFunctionsTest/Exp/Exp1. 2) CqlArithmeticFunctionsTest/Negate/NegateMaxLong - set the expected result to -9223372036854775807L (-(2^63 - 1)).

This PR addresses the tests for aggregate functions, aggregate queries, and arithmetic functions, to make it easier to review and merge early. The rest will be covered in subsequent PRs.

---

I used this TS script to compare the test files:

const cqlContent = '<content of CQL file e.g. CqlAggregateFunctionsTest.cql>';
const xmlContent = '<content of XML file e.g. CqlAggregateFunctionsTest.xml>';

const cqlTests = cqlContent.split('\ndefine ').slice(1).map(_ => ({
    name: _.split(':')[0].trim(),
    expression: _.split(':').slice(1).join(':').split('\n').map((line) => line.split('//')[0]).join('\n').trim(),
}))
const xmlTests = Array.from(new JSDOM(xmlContent, { contentType: 'text/xml' }).window.document.documentElement.querySelectorAll('test')).map(_ => ({
    name: _.getAttribute('name'),
    expression: _.querySelector('expression').textContent,
}))

for (const cqlTest of cqlTests) {
    const xmlTest = xmlTests.find(_ => _.name === cqlTest.name);
    if (!xmlTest) {
        console.log(`Test ${cqlTest.name} not found in XML`);
        continue;
    }
    if (cqlTest.expression !== xmlTest.expression) {
        console.log(`Test ${cqlTest.name} has different expressions in CQL and XML`);
    }
}

[github-actions[bot]]

Formatting check succeeded!

[codecov[bot]]

Codecov Report

All modified and coverable lines are covered by tests :white_check_mark:

Project coverage is 63.73%. Comparing base (7e91478) to head (67cf75d).

Additional details and impacted files

```diff @@ Coverage Diff @@ ## master #1396 +/- ## ============================================ - Coverage 63.73% 63.73% -0.01% - Complexity 2665 2666 +1 ============================================ Files 493 493 Lines 27774 27774 Branches 5521 5521 ============================================ - Hits 17703 17702 -1 Misses 7830 7830 - Partials 2241 2242 +1 ```

:umbrella: View full report in Codecov by Sentry.
:loudspeaker: Have feedback on the report? Share it here.