Check transforms in packages that have them

[jsoriano]

For packages that have transforms, check that they are collecting valid documents.

Fix #1402.

[jsoriano]

test integrations

[elasticmachine]

Created or updated PR in integrations repostiory to test this vesrion. Check elastic/integrations#7561

[mrodm]

Nice to have validation around transforms too!

[mrodm]

Probably it's not needed. I was wondering if at the end of the system test execution we should delete the indices created by the transforms.
Something similar to what it's done here for the main data stream

elastic-package/internal/testrunner/runners/system/runner.go

Lines 552 to 558 in 3295997

	r.wipeDataStreamHandler = func() error {
	logger.Debugf("deleting data in data stream...")
	if err := deleteDataStreamDocs(r.options.API, dataStream); err != nil {
	return fmt.Errorf("error deleting data in data stream: %w", err)
	}
	return nil
	}

Or maybe it's better to leave that management to Fleet.

[jsoriano]

Yeah, I think it wouldn't be needed because the source data is already deleted. The transform should be deleted by Fleet, but I think it is not doing it.

[jsoriano]

/test

[elasticmachine]

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cc @jsoriano