ci: test-spec: align test spec for CI-test-low-level

Currently only used tests/benchmarks/multicore/idle

Signed-off-by: Piotr Kosycarz <[email protected]>

.github/test-spec.yml

@@ -591,9 +591,7 @@
   - "samples/event_manager_proxy/**/*"
   - "snippets/emulated-*/**/*"
   - "tests/subsys/event_manager_proxy/**/*"
-  - "tests/benchmarks/current_consumption/**/*"
-  - "tests/benchmarks/multicore/**/*"
-  - "tests/benchmarks/peripheral_load/**/*"
+  - "tests/benchmarks/multicore/idle/**/*"
   - "tests/drivers/pwm/**/*"
   - "tests/drivers/sensor/**/*"