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fix(studio): encode special characters in table editor policy links (#45846)

Closes #45845.

## Summary

`GridHeaderActions.tsx` interpolated `table.name` and `table.schema`
directly into the policies URL at two `<Link href>` builders. A table or
schema containing `&`, `=`, `+`, or `#` corrupted the destination and
routed users to the wrong policies filter.

Extracts the URL into `getTablePoliciesUrl` in `TableEntity.utils.ts`
with `encodeURIComponent` wraps, and replaces both inline
interpolations. Same pattern as #45385 (Linter shortcut links).

## Test plan

Added four `getTablePoliciesUrl` cases in `TableEntity.utils.test.ts`:
plain values, special chars in name, special chars in schema, special
chars in both. Existing seven tests in the same file still pass.

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## Summary by CodeRabbit

* **Refactor**
* Improved Row-Level Security (RLS) policy URL handling in the table
editor using a shared utility function for consistent URL building and
proper parameter encoding.

* **Tests**
* Added test coverage for RLS policy URL generation with various
parameter combinations and special character handling.

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