PHP8.2 Support in CMS5 for core modules

[maxime-rainville]

The first alpha of PHP8.2 is available. It's meant to reach feature freeze on July 19.

Acceptance criteria

• [x] We have a clearly documented way of running a dev environment on pre-release PHP8.2. That's mostly targeted toward the internal SIlverstripe dev team. You should be able to install PHP 8.2 just like any other version as it's now stable
• [ ] CMS5 core and supported module builds can run PHP8.2. << I've split off a [new issue for supported modules](https://github.com/silverstripe/silverstripe-framework/issues/10618)
• [x] Syntax/constructs deprecated in PHP8.2 are no longer used.

Notes

• Queued Job will probably hate the Dynamic Properties are deprecated, If it requires substantial refactor, split it off as a separate card.
• https://github.com/symbiote/silverstripe-queuedjobs/issues/377

New issues created

• https://github.com/silverstripe/silverstripe-graphql/issues/511 << Blocks PHP 8.2 support for us
• https://github.com/silverstripe/silverstripe-framework/issues/10618

Third party issues created

• https://github.com/symfony/symfony/issues/48637 << this may be a non-issue for us, I didn't see this warning during testing, however I did detect it doing a string search for dynamic properties for things that could potentially go wrong e.g. not covered by unit tests

Third party PRs

• https://github.com/webonyx/graphql-php/pull/1256 << PR was for 14.x - only 15 (in beta) is supported, have asked when stable for 15 is being released - for our policy we should technically be using a stable not a beta
• https://github.com/oscarotero/html-parser/pull/4

CI Integration test

- https://github.com/emteknetnz/silverstripe-installer/actions/runs/3711071825

PRs

• https://github.com/silverstripe/gha-generate-matrix/pull/39 << Merge on the non-core PHP 8.2 card
• https://github.com/silverstripe/silverstripe-framework/pull/10614
• https://github.com/silverstripe/silverstripe-assets/pull/535
• https://github.com/silverstripe/silverstripe-versioned/pull/386
• https://github.com/silverstripe/silverstripe-assets/pull/533
• https://github.com/silverstripe/silverstripe-config/pull/77
• https://github.com/silverstripe/silverstripe-framework/pull/10628

[emteknetnz]

We're blocked on:

• webonyx/graphql-php v15 being tagged stable / us upgrading silverstripe/graphl to use v15
• oscarotero/html-parser PR being merged and tagged
• CMS 5 compatible kitchen-sink branches being available

I've reduced the scope of this issue to "core" modules only and I've created a new issue to handle kitchen-sink

Given that graphql is "core", even when we close this issue we still won't have core support for PHP 8.2 - though we should once we've completed the webonyx/graphql-php v15 issue

[GuySartorelli]

@emteknetnz Your external PR https://github.com/oscarotero/html-parser/pull/4 has been merged and tagged - do we need to change the minimum depencency or are we okay with --prefer-lowest not being 8.2 compatible? I think just leave as is but wanna confirm.

If we don't need to change that, this can be closed.

[emteknetnz]

May as well update the minimum installable version https://github.com/silverstripe/silverstripe-framework/pull/10628