Automatically set make_distributed_plan=1 when distributed_plan_workers_num != 0

### Company or project name

_No response_

### Use case

For convenience, so we don't have to specify both. Previous improvement: https://github.com/ClickHouse/ClickHouse/pull/112463.

### Describe the solution you'd like

Automatically set make_distributed_plan=1 when distributed_plan_workers_num != 0

### Describe alternatives you've considered

_No response_

### Additional context

_No response_

Read the previous improvement in PR #112463 and locate the settings handling for make_distributed_plan and distributed_plan_workers_num. Check how the settings interact, then implement the requested automatic behavior and run the relevant tests for distributed query planning. Done means a nonzero distributed_plan_workers_num enables make_distributed_plan without requiring both settings to be specified.

Written by the indexing model from the issue text.