feat: allow schedulers to run in a single node

[gastonfournier]

About the changes

This PR provides a service that allows a scheduled function to run in a single instance. It's currently not in use but tests show how to wrap a function to make it single-instance:

unleash/src/lib/features/scheduler/job-service.test.ts

Lines 26 to 32 in 65b7080

	const job = service.singleInstance(
	'test',
	async () => {
	counter++;
	},
	60,
	);

The key 'test' is used to identify the group and most likely should have the same name as the scheduled job.

[gastonfournier]

cc @kwasniew @sjaanus just FYI cause it's related to schedulers. Maybe you have a candidate for this functionality, but first we're going to test it in enterprise customers with the feature we are developing. Maybe we can wait until it's actually tested to use it elsewhere but just keep it in mind ;)

[chriswk]

Other than the slight mismatch in our down migration, this looks good to me.

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[codescene-delta-analysis]

❌ Code Health Quality Gates: FAILED

• Declining Code Health: 1 findings(s) 🚩
• Improving Code Health: 1 findings(s) ✅
• Affected Hotspots: 1 files(s) 🔥

View detailed results in CodeScene

[codescene-delta-analysis]

✅ Getting better: Large Method
scheduleServices decreases from 137 to 133 lines of code, threshold = 70