feat: Allow ignoring minidumps from specific processes

[timfish]

Adds a feature to sentryMinidumpIntegration that allows you to ignore/skip minidumps from specific processes:

import * as Sentry from '@sentry/electron/main';

Sentry.init({
  dsn: '__DSN__',
  integrations: [sentryMinidumpIntegration({ ignoredProcesses: ['GPU', 'utility', 'unknown'] })],
});

Ignored minidumps will no longer impact the crash free session rate.

This PR also adds tests for:

• Electron utility process crash
• child_process.fork Node process crash
• child_process.exec executable crash

Not all platforms can capture child process crashes:

	event.process	macOS	Windows	Linux
Electron utilityProcess	utility	✅	✅	✅ 1
child_process.fork	node	✅	✅	❌
child_process.exec	unknown	✅	❌	❌

• ¹ Not working with v29.4.6. Possibly an Electron bug that won't get fixed because v29 is already EOL.

[timfish]

It looks like the Electron Utility process crash doesn't result in a minidump on Ubuntu for Electron v29.4.6!

[timfish]

Rather than merge this PR, I'm fixing beforeSend so that returning null does not impact release health.

• Native events ignored via beforeSend still impact release health #1062