feat(tests): Fail on PHPUnit warnings and risky tests, show deprecations

[come-nc]

Summary

Fail on PHPUnit warnings and risky tests, show deprecations.

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)

[come-nc]

nodb tests are now passing.
There is still work on DB tests.

For s3 tests, we have:

3 tests triggered 4 PHP warnings:

1) /home/runner/actions-runner/_work/server/server/lib/private/Files/ObjectStore/S3ObjectTrait.php:74
fopen(http://localhost:9000/nextcloud/2): Failed to open stream: HTTP request failed! HTTP/1.1 404 Not Found

Triggered by:

* Test\Files\ObjectStore\S3Test::testDelete
  /home/runner/actions-runner/_work/server/server/tests/lib/Files/ObjectStore/ObjectStoreTestCase.php:64

2) /home/runner/actions-runner/_work/server/server/lib/private/Files/Stream/SeekableHttpStream.php:50
fopen(httpseek://): Failed to open stream: "OC\Files\Stream\SeekableHttpStream::stream_open" call failed

Triggered by:

* Test\Files\ObjectStore\S3Test::testDelete
  /home/runner/actions-runner/_work/server/server/tests/lib/Files/ObjectStore/ObjectStoreTestCase.php:64

* Test\Files\ObjectStore\S3Test::testEmptyUpload
  /home/runner/actions-runner/_work/server/server/tests/lib/Files/ObjectStore/S3Test.php:107

* Test\Files\ObjectStore\S3Test::testReadNonExisting
  /home/runner/actions-runner/_work/server/server/tests/lib/Files/ObjectStore/ObjectStoreTestCase.php:83

3) /home/runner/actions-runner/_work/server/server/lib/private/Files/ObjectStore/S3ObjectTrait.php:74
fopen(http://localhost:9000/nextcloud/non-existing): Failed to open stream: HTTP request failed! HTTP/1.1 [40](https://github.com/nextcloud/server/actions/runs/17771530041/job/50508637858?pr=54905#step:7:41)4 Not Found

Triggered by:

* Test\Files\ObjectStore\S3Test::testReadNonExisting
  /home/runner/actions-runner/_work/server/server/tests/lib/Files/ObjectStore/ObjectStoreTestCase.php:83

4) /home/runner/actions-runner/_work/server/server/lib/private/Files/ObjectStore/S3ObjectTrait.php:74
fopen(http://localhost:9000/nextcloud/emptystream): Failed to open stream: HTTP request failed! HTTP/1.1 [41](https://github.com/nextcloud/server/actions/runs/17771530041/job/50508637858?pr=54905#step:7:42)6 Requested Range Not Satisfiable

Triggered by:

* Test\Files\ObjectStore\S3Test::testEmptyUpload
  /home/runner/actions-runner/_work/server/server/tests/lib/Files/ObjectStore/S3Test.php:107

There is no easy way to ignore those it seems, apart from using a custom error handler for these tests.
Should we do that? It seems the code intent is that fopen warning gets logged.

[come-nc]

ref sebastianbergmann/phpunit#5062

[provokateurin]

🐘