Add changelog entries for 2.6 include fixes (ansible#39750)

changelogs/fragments/includes.yaml

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+---
+minor_changes:
+- import/include - Cache task_vars to speed up IncludedFile.process_include_results (https://github.com/ansible/ansible/pull/39026)
+
+bugfixes:
+- import/include - Update TaskInclude _raw_params with the expanded/templated path to file allowing nested includes using host vars in file (https://github.com/ansible/ansible/pull/39365)
+- dynamic includes - Don't treat undefined vars for conditional includes as truthy (https://github.com/ansible/ansible/pull/39377)
+- import/include - Ensure role handlers have the proper parent, allowing for correct attribute inheritance (https://github.com/ansible/ansible/pull/39426)
+- include_role/import_role - Use the computed role name for include_role/import_role so to diffentiate between names computed from host vars (https://github.com/ansible/ansible/pull/39516)
+- import_playbook - Pass vars applied to import_playbook into parsing of the playbook as they may be needed to parse the imported plays (https://github.com/ansible/ansible/pull/39521)
+- include_role/import_role - Don't overwrite included role handlers with play handlers on parse (https://github.com/ansible/ansible/pull/39563)
+- dynamic includes - Improved performance by fixing re-parenting on copy (https://github.com/ansible/ansible/pull/38747)
+- dynamic includes - Fix IncludedFile comparison for free strategy (https://github.com/ansible/ansible/pull/37083)
+- dynamic includes - Allow inheriting attributes from static parents (https://github.com/ansible/ansible/pull/38827)
+- include_role/import_role - improved performance and recursion depth (https://github.com/ansible/ansible/pull/36470)
+- include_role/import_role - Fix parameter templating (https://github.com/ansible/ansible/pull/36372)