openstack_test: truncate allow/block txt once before multi-file convert

Per-iteration truncate in convert_yaml_tests_file_to_txt dropped earlier
blocklist regex lines when lb_tests passes ingress + isolated blocklists.

Co-authored-by: Cursor <cursoragent@cursor.com>

Author: tusharjadhav3302

collection/stages/roles/openstack_test/tasks/run_openstack_test.yml

@@ -96,6 +96,12 @@
   changed_when: true
   when: not (openstack_test_use_ote | bool)
 
+- name: Remove stale allowlist txt before YAML conversion
+  ansible.builtin.file:
+    path: "{{ allowlist_path }}"
+    state: absent
+  when: openstack_tests_allowlist_file != ''
+
 - name: Convert the allowlist YAML files to TXT
   ansible.builtin.include_role:
     name: tools_openshift_tests
@@ -106,6 +112,12 @@
   with_items: "{{ openstack_tests_allowlist_file.split(',') }}"
   when: openstack_tests_allowlist_file != ''
 
+- name: Remove stale blocklist txt before YAML conversion
+  ansible.builtin.file:
+    path: "{{ blocklist_path }}"
+    state: absent
+  when: openstack_tests_blocklist_file != ''
+
 - name: Convert the blocklist YAML files to TXT
   ansible.builtin.include_role:
     name: tools_openshift_tests

collection/tools/roles/tools_openshift_tests/tasks/convert_yaml_tests_file_to_txt.yml

@@ -8,11 +8,6 @@
     yaml_testslist: "{{ yaml_testslist[discovered_openshift_release][discovered_ocp_network_type] }}"
   when: yaml_format_based_on_ocp_version|default(False)
 
-- name: Remove stale "{{ output_tests_list }}" before rewrite
-  ansible.builtin.file:
-    path: "{{ output_tests_list }}"
-    state: absent
-
 - name: Create the "{{ output_tests_list }}" file
   ansible.builtin.file:
     path: "{{ output_tests_list }}"