ci(ulp): re-enable legacy ULP buildv2 jobs

tools/ci/dynamic_pipelines/scripts/patch_buildv2_child_pipeline.py

@@ -6,8 +6,8 @@ The buildv2 build child pipeline is generated by ``idf-ci gitlab build-child-pip
 from the same manifest as the default pipeline. This script post-processes that
 generated YAML so the cmakev2 path is exercised end to end:
 
-1. Point child build jobs at the buildv2 generator artifacts, then inject
-   ``IDF_BUILD_V2`` so cmake activates the cmakev2 shim.
+1. Inject ``IDF_BUILD_V2`` into each child build job so cmake activates the
+   cmakev2 shim.
 
 2. Inject ``PIPELINE_COMMIT_SHA: ${PIPELINE_COMMIT_SHA}_buildv2`` into each child
    build job. idf-ci reads ``PIPELINE_COMMIT_SHA`` when computing the s3
@@ -27,13 +27,6 @@ import argparse
 import yaml
 
 PIPELINE_COMMIT_SHA_V2 = '${PIPELINE_COMMIT_SHA}_buildv2'
-BUILDV2_GENERATOR_JOB = 'generate_build_child_pipeline_buildv2'
-
-
-def _use_buildv2_generator_artifacts(job: dict) -> None:
-    for need in job.get('needs', []):
-        if isinstance(need, dict) and need.get('job') == 'generate_build_child_pipeline':
-            need['job'] = BUILDV2_GENERATOR_JOB
 
 
 def patch(path: str) -> None:
@@ -43,7 +36,6 @@ def patch(path: str) -> None:
     injected = []
     for k, v in d.items():
         if isinstance(v, dict) and 'extends' in v:
-            _use_buildv2_generator_artifacts(v)
             v.setdefault('variables', {})['IDF_BUILD_V2'] = '1'
             v['variables']['PIPELINE_COMMIT_SHA'] = PIPELINE_COMMIT_SHA_V2
             injected.append(k)

tools/test_apps/system/.build-test-rules.yml

@@ -194,9 +194,6 @@ tools/test_apps/system/ram_loadable_app:
       reason: cannot pass # TODO: IDF-15525
 
 tools/test_apps/system/rtc_mem_reserve:
-  disable:
-    - if: IDF_BUILD_V2 == "1"
-      reason: Legacy ULP apps are covered by CMake v1; buildv2 covers full_subproject ULP apps.
   enable:
     - if: IDF_TARGET in ["esp32p4"]
       reason: only P4 has a potential conflict due to using rtc mem for lp rom data/stack