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10fef8bd - [`flake8-import-conventions`] Improve syntax check for aliases supplied in configuration for `unconventional-import-alias (ICN001)` (#14745)

[`flake8-import-conventions`] Improve syntax check for aliases supplied in configuration for `unconventional-import-alias (ICN001)` (#14745) This PR improves on #14477 by: - Ensuring user's do not require the module alias "__debug__", which is unassignable - Validating the linter settings for `lint.flake8-import-conventions.extend-aliases` (whereas previously we only did this for `lint.flake8-import-conventions.aliases`). Closes #14662