remove generate_beta_sdk parameter from generate_typespec_project

The preview version is set again after generation with the correct
release_beta_sdk value, so the pre-generation call defaults to True.

Co-authored-by: Copilot <223556219+Copilot@users.noreply.github.com>

Author: XiaofeiCao

eng/automation/generate.py

@@ -359,7 +359,6 @@ def sdk_automation_typespec_project(tsp_project: str, config: dict) -> dict:
         remove_before_regen=True,
         group_id=GROUP_ID,
         api_version=api_version,
-        generate_beta_sdk=release_beta_sdk,
     )
 
     if succeeded:

eng/automation/generate_utils.py

@@ -532,7 +532,6 @@ def generate_typespec_project(
     remove_before_regen: bool = False,
     group_id: str = None,
     api_version: str = None,
-    generate_beta_sdk: bool = True,
     version: str = None,  # SDK version
     disable_customization: bool = False,
     **kwargs,
@@ -610,10 +609,6 @@ def generate_typespec_project(
 
                 if remove_before_regen and group_id:
                     remove_generated_source_code(os.path.join(sdk_root, sdk_folder), f"{group_id}.{service}")
-                    _, current_version = set_or_increase_version(
-                        sdk_root, group_id, module, version=version, preview=generate_beta_sdk
-                    )
-                    emitter_options.append(f"package-version={current_version}")
                     if api_version:
                         emitter_options.append(f"api-version={api_version}")