ref(core): Add MonitorConfigUtils to convert schedules to monitor configs

[wedamija]

📜 Description

Adds an internal helper, MonitorConfigUtils, that turns a job's schedule (a cron expression or a fixed interval, plus its time zone) into the MonitorConfig Sentry uses to create and update cron monitors.

It only returns a config when Sentry would read the schedule the same way the scheduler runs it. Cron dialects differ from the crontab format Sentry uses (seconds fields, day-of-week numbering, how day-of-month and day-of-week combine, older Spring parser rules), so schedules that can't be represented exactly get no config rather than a wrong one. A wrong schedule would cause false "missed check-in" alerts.

💡 Motivation and Context

Check-ins sent without a monitor config are dropped when the monitor doesn't exist yet, so users have to create every monitor by hand. Sending the config from code lets monitors be created and kept in sync automatically. This helper is the shared piece that the Spring (#6215) and Quartz (#6216) integrations use to do that.

💚 How did you test it?

Unit tests in MonitorConfigUtilsTest. Also compared the next fire times of 200k random cron expressions per scheduler (Spring 6.2, 5.3, 5.2 and Quartz 2.3) against Sentry's own cron parser: no mismatches for converted expressions.

📝 Checklist

• I added GH Issue ID & Linear ID
• I added tests to verify the changes.
• No new PII added or SDK only sends newly added PII if sendDefaultPII is enabled.
• I updated the docs if needed.
• I updated the wizard if needed.
• Review from the native team if needed.
• No breaking change or entry added to the changelog.
• No breaking change for hybrid SDKs or communicated to hybrid SDKs.
• Public API changes reviewed by another Mobile SDK team member or implemented according to the develop docs spec.

🔮 Next steps

#6215 and #6216 build on this.

#skip-changelog

[sentry]

📲 Install Builds

Android

🔗 App Name	App ID	Version	Configuration
SDK Size	io.sentry.tests.size	8.59.0 (1)	release

⚙️ sentry-android Build Distribution Settings

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