refactor(dlx): remove unused call option and improve test isolation

Remove call option:
- Removed call option from DlxPackageOptions interface (not yet implemented)
- Only keep implemented options: yes, quiet, force
- Follows "don't add it if it's not used" principle

Improve test isolation:
- Refactored dlx-package tests to use runWithTempDir helper
- Each test now runs in its own isolated temporary directory
- Eliminates shared state and potential race conditions
- Aligns with dlx-binary test patterns for consistency
- Better support for parallel test execution

Benefits:
- Cleaner API surface (no unused options)
- More reliable tests with proper isolation
- Consistent test patterns across dlx modules
- Prevents flaky tests from shared temp directory usage

Author: jdalton

src/dlx-package.ts

@@ -138,12 +138,6 @@ export interface DlxPackageOptions {
    */
   quiet?: boolean | undefined
 
-  /**
-   * Shell command to execute in package context.
-   * Aligns with npx --call flag.
-   */
-  call?: string | undefined
-
   /**
    * Additional spawn options for the execution.
    */