tests: cleanup metadata and filtering

- Add integration_platforms to avoid excessive filtering
- Make sure integration platforms are actually part of the filter
- Fix some tags and test meta data

Signed-off-by: Anas Nashif <anas.nashif@intel.com>

samples/basic/button/sample.yaml

@@ -6,5 +6,7 @@ tests:
       - button
       - gpio
     filter: dt_enabled_alias_with_parent_compat("sw0", "gpio-keys")
+    integration_platforms:
+      - nrf52833dk_nrf52820
     depends_on: gpio
     harness: button

samples/basic/fade_led/sample.yaml

@@ -8,3 +8,5 @@ tests:
     depends_on: pwm
     harness: led
     filter: dt_alias_exists("pwm-led0") and dt_compat_enabled("pwm-leds")
+    integration_platforms:
+      - nrf51dk_nrf51422

samples/basic/rgb_led/sample.yaml

@@ -2,10 +2,12 @@ sample:
   name: RGB LED
 tests:
   sample.basic.rgb_led:
-    filter: dt_alias_exists("red-pwm-led") and dt_alias_exists("green-pwm-led") and
-      dt_alias_exists("blue-pwm-led")
+    filter: dt_alias_exists("red-pwm-led") and dt_alias_exists("green-pwm-led")
+      and dt_alias_exists("blue-pwm-led")
     tags:
       - drivers
       - pwm
     depends_on: pwm
     harness: led
+    integration_platforms:
+      - nrf52840_mdk

samples/basic/servo_motor/sample.yaml

@@ -8,3 +8,5 @@ tests:
     depends_on: pwm
     harness: motor
     filter: dt_compat_enabled("pwm-servo")
+    integration_platforms:
+      - bbc_microbit

samples/basic/threads/sample.yaml

@@ -9,6 +9,8 @@ tests:
       - gpio
     filter: dt_enabled_alias_with_parent_compat("led0", "gpio-leds") and
             dt_enabled_alias_with_parent_compat("led1", "gpio-leds")
+    integration_platforms:
+      - nrf52833dk_nrf52820
     depends_on: gpio
     harness: console
     harness_config: