test(query-devtools/Devtools): add tests for settings menu (#10690)

* test(query-devtools/Devtools): add tests for settings menu

* ci: apply automated fixes

* test(query-devtools/Devtools): fail fast with 'expect' instead of conditional guards on selector lookups

* test(query-devtools/Devtools): coerce 'el.textContent' to string for 'TS18047' under strict 'vue-tsc' build

* test(query-devtools/Devtools): remove redundant 'should render the settings button' covered by other settings menu tests

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Co-authored-by: autofix-ci[bot] <114827586+autofix-ci[bot]@users.noreply.github.com>