fix: nested dataset discovery and parallel invalid-dataset reporting

[stsepelin]

What:

• Bug Fix
• New Feature

Description:

This PR follows up on #1427 and fixes two related problems in Pest's parallel execution flow.

First, it fixes nested dataset discovery for datasets stored in nested Datasets/ directories, addressing #1121.

Second, it fixes parallel reporting when a dataset is invalid or missing, so these cases are surfaced correctly as failures rather than being lost in the summary, addressing #1185.

The PR also adds regression coverage for both scenarios and keeps the success snapshot coverage in place with a lower memory limit for the visual snapshot test.

Related:

• Fixes [Bug]: Cannot use Datasets in subfolders  #1121
• Refs [Bug]: invalid dataset not showing as FAILED when running with --parallel #1185
• Follow-up to 4.x #1427

[thomas-0816]

Thank You!
I guess the changes in src/Support/StateGenerator.php should fix #1462 and #1463 .

@stsepelin Should these methods from https://github.com/sebastianbergmann/phpunit/blob/main/src/Runner/TestResult/TestResult.php also be handled in src/Support/StateGenerator.php ?

• public function testRunnerTriggeredDeprecationEvents() // added in phpunit 12
• public function testRunnerTriggeredNoticeEvents() // added in phpunit 12
• public function testRunnerTriggeredWarningEvents() // added in phpunit 12
• public function testSuiteSkippedEvents()
• public function errors()

[nunomaduro]

@thomas-0816 all of them.

[stsepelin]

Thanks for the merge!

Opened a follow-up PR to handle the remaining PHPUnit\TestRunner\TestResult\TestResult methods you mentioned
(testRunnerTriggered{Deprecation,Notice,Warning}Events, testSuiteSkippedEvents, errors): #1683.

That also covers the "missing implementations in StateGenerator.php"
part of #1462.