chore!: upgrade to nx 18

[NachoVazquez]

PR Checklist

Please check if your PR fulfills the following requirements:

• The commit message follows our guidelines: CONTRIBUTING.md#commit
• Tests for the changes have been added (for bug fixes / features)
• Docs have 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
[ ] CI related changes
[ ] Documentation content changes
[ ] Other... Please describe:

What is the current behavior?

We support Nx 17

What is the new behavior?

We added support to Nx 18

Does this PR introduce a breaking change?

[x] Yes
[ ] No

BREAKING CHANGES:

• Support moved from Nx 17 to Nx 18

[cloudflare-workers-and-pages]

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Latest commit:	98d8061
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Branch Preview URL:	https://chore-upgrade-to-nx-18.oss-9xl.pages.dev

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