Fix coverage output - properly await async done() callback

- Mocha callback wasn't awaiting the async done() function
- Changed mocha.run(() => done()) to mocha.run(async () => await done())
- Added error handling to coverage generation
- This ensures recorder tasks in event.all.after complete before process exit

Author: kobenguyent

lib/codecept.js

@@ -279,7 +279,7 @@ class Codecept {
 
       try {
         event.emit(event.all.before, this)
-        mocha.run(() => done())
+        mocha.run(async () => await done())
       } catch (e) {
         output.error(e.stack)
         reject(e)

lib/plugin/coverage.js

@@ -154,8 +154,13 @@ export default function (config) {
     recorder.add(
       'generate coverage report',
       async () => {
-        output.print(`writing ${coverageOptions.outputDir}`)
-        await coverageReport.generate()
+        try {
+          output.print(`writing ${coverageOptions.outputDir}`)
+          await coverageReport.generate()
+        } catch (error) {
+          output.print(`Failed to generate coverage report: ${error.message}`)
+          // Don't throw - coverage failure shouldn't fail tests
+        }
       },
       true,
       false,