chore(telemetry): use accurate wording in post-emit warn

`warnPostEmit` is shared by seven methods now, including `log`,
`logError`, and `phase`, which aren't strictly mutations. "mutation
dropped" was accurate only for the original setProperty/setMeasurement
callers. Generalize to "call ignored".

Author: EhabY

src/telemetry/service.ts

@@ -178,7 +178,7 @@ export class TelemetryService implements vscode.Disposable, TelemetryReporter {
 		let mark: "aborted" | "error" | undefined;
 		const warnPostEmit = (op: string, name: string): void => {
 			this.logger.warn(
-				`Telemetry span '${eventName}' ${op}('${name}') called after emit; mutation dropped`,
+				`Telemetry span '${eventName}' ${op}('${name}') called after emit; call ignored`,
 			);
 		};
 		const emitSpanLog = (