[stable34] chore(ci): Remove code coverage from stable branches

[come-nc]

Summary

• Follow-up of [stable34] chore: Reduce PHPUnit test matrix on stable34 and remove coverage #61331
• Also includes backport of test(s3): fix flaky EOF check and remove PHP 8.5 skip #61275

Checklist

• Code is properly formatted
• Sign-off message is added to all commits
• Tests (unit, integration, api and/or acceptance) are included
• Screenshots before/after for front-end changes
• Documentation (manuals or wiki) has been updated or is not required
• Backports requested where applicable (ex: critical bugfixes)
• Labels added where applicable (ex: bug/enhancement, 3. to review, feature component)
• Milestone added for target branch/version (ex: 32.x for stable32)

AI (if applicable)

• The content of this PR was partly or fully generated using AI

[come-nc]

php8.4-s3 is super flaky, looks like it was not the case on PHP 8.3 🤔

[come-nc]

		if (str_starts_with(PHP_VERSION, '8.3') && getenv('CI')) {
			$this->markTestSkipped('Test is unreliable and skipped on 8.3');
		}

The test was skipped on 8.3

[come-nc]

• test(s3): fix flaky EOF check and remove PHP 8.5 skip #61275 is the solution, I’m gonna include it in this PR

[come-nc]

The failures are not related, cypress is unrelated and PHPUnit OCI are timeouts. I will try later to backport Anna’s fix for these timeouts as well.