[SPARK-50919][ML][PYTHON][CONNECT] Support LinearSVC on connect

### What changes were proposed in this pull request?
Support LinearSVC on connect

### Why are the changes needed?
For feature parity

### Does this PR introduce _any_ user-facing change?
yes

### How was this patch tested?
added tests

### Was this patch authored or co-authored using generative AI tooling?
no

Closes #49625 from zhengruifeng/ml_connect_svc.

Authored-by: Ruifeng Zheng <ruifengz@apache.org>
Signed-off-by: Ruifeng Zheng <ruifengz@apache.org>