Add summary even when failure threshold is surpassed

Alerts are currently generated by throwing an exception. This means that
all code that comes after that exception is skipped, including generating
the Action summary.

We can easily fix this, by generating the summary first.

Longer term, we might want to reconsider the code style here.
An exception should model something exceptional happening in our code.
Seeing bad benchmark numbers is not exceptional. It's what this tool is
supposed to handle.

Closes #254

src/write.ts

@@ -541,8 +541,8 @@ export async function writeBenchmark(bench: Benchmark, config: Config) {
         core.debug('Alert check was skipped because previous benchmark result was not found');
     } else {
         await handleComment(name, bench, prevBench, config);
-        await handleAlert(name, bench, prevBench, config);
         await handleSummary(name, bench, prevBench, config);
+        await handleAlert(name, bench, prevBench, config);
     }
 }