fix: stringify sinon.Call.args[1] before regex test

CI's TypeScript was stricter than the local version and rejected the
untyped `c.args[1]` passed to `RegExp.test()`. Wrap in `String(...)`
so the tests compile on Node 14/16/18/20 runners.

Co-authored-by: Isaac
Signed-off-by: samikshya-chand_data <samikshya.chand@databricks.com>

Author: samikshya-db

tests/unit/telemetry/DatabricksTelemetryExporter.test.ts

@@ -308,7 +308,9 @@ describe('DatabricksTelemetryExporter', () => {
       await exporter.export([makeMetric()]);
       await exporter.export([makeMetric()]);
 
-      const warnCalls = logSpy.getCalls().filter((c) => c.args[0] === LogLevel.warn && /Authorization/.test(c.args[1]));
+      const warnCalls = logSpy
+        .getCalls()
+        .filter((c) => c.args[0] === LogLevel.warn && /Authorization/.test(String(c.args[1])));
       expect(warnCalls.length).to.equal(1);
     });
 
@@ -327,7 +329,9 @@ describe('DatabricksTelemetryExporter', () => {
       headers = {};
       await exporter.export([makeMetric()]); // warns again
 
-      const warnCalls = logSpy.getCalls().filter((c) => c.args[0] === LogLevel.warn && /Authorization/.test(c.args[1]));
+      const warnCalls = logSpy
+        .getCalls()
+        .filter((c) => c.args[0] === LogLevel.warn && /Authorization/.test(String(c.args[1])));
       expect(warnCalls.length).to.equal(2);
     });
   });