feat: upgrade Angular dependencies to v18 pre-release versions

[timdeschryver]

PR Checklist

Please check if your PR fulfills the following requirements:

• [x] The commit message follows our guidelines: https://github.com/ngrx/platform/blob/main/CONTRIBUTING.md#commit
• [x] Tests for the changes have been added (for bug fixes / features)
• [x] Documentation has been added / updated (for bug fixes / features)

PR Type

What kind of change does this PR introduce?

[ ] Bugfix
[ ] Feature
[ ] Code style update (formatting, local variables)
[ ] Refactoring (no functional changes, no api changes)
[x] Build related changes
[x] CI related changes
[ ] Documentation content changes
[ ] Other... Please describe:

What is the current behavior?

Closes #

What is the new behavior?

Does this PR introduce a breaking change?

[x] Yes
[ ] No

BREAKING CHANGES:

The minimum required version of Angular has been updated

BEFORE:

The minimum required version of Angular is 17.x

AFTER:

The minimum required version of Angular is 18.x

Other information

• I've copy-pasted the standalone AST utils that were previously available via @schematics/angular/private/standalone. There were rewritten and our schematics needs to be adjusted to make use of the new methods. Because this will take some time, I just copy-pasted the older implementation that we used.

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[brandonroberts]

We should update the ng-packgr dependency to the 18.0.0-next.x release also