Important: An intentional effort is being made during migration to not
modify runtime behavior. This implies that there will be several
assertions, non-null assertions, and @ts-expect-error. This philosophy
applies only to migrating old code to TypeScript strict, not to writing
new code. For a more detailed justification for this reasoning,
https://github.com/payloadcms/payload/pull/11840#discussion_r2021975897.
In this PR, instead of following the approach of migrating a subset of
files, I'm migrating all files by disabling a specific rule. In this
case, `strictNullChecks`.
`strictNullChecks` is a good rule to start the migration with because
it's easy to silence with non-null assertions or optional chainings.
Additionally, almost all ts strict errors are due to this rule.
This PR improves 200+ files, leaving only 68 remaining to migrate to
strict mode in the payload package.
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