docs: conditional row-level access and allow_all in access policies

[mintlify]

Documents the new capabilities added in #10767:

• Reference (reference/data-modeling/data-access-policies.mdx)

  • Documents row_level.allow_all: true and allow_all: false with a YAML/JS <CodeGroup>.
  • Adds a short note that row_level can be made conditional via conditions (YAML) or by returning different filters from securityContext (JS), linking to the new recipe.
  • Adds a new Boolean logic in if expressions subsection under conditions covering and/or/not (YAML) vs &&/||/! (JS), AND-across-conditions, OR-across-policies, with a YAML+JS <CodeGroup>.

• New recipe (recipes/access-control/conditional-row-level-access.mdx)

  • Region/group-based switching: different row_level filters depending on securityContext.groups membership, with a JS variant that returns filters as a function of securityContext.
  • Admin override: a second policy granting row_level.allow_all: true when securityContext.is_admin, demonstrating OR-across-policies.
  • Composing boolean logic in conditions to switch which filter applies.

• Guide (docs/data-modeling/data-access-policies.mdx)

  • Adds a short pointer section linking to the new recipe; keeps the guide concise.

• Nav (docs.json): adds an "Access Control" group under Recipes with the new page.

Every example includes both YAML and JavaScript inside a <CodeGroup>. Uses securityContext/security_context and userAttributes/user_attributes consistently per language.

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