tests/drivers uart_mix_fifo_poll: Filter out repetitive tests

Do not run in CI all tests, as they have very similar configuration
and provide little extra coverage to justify the extra CI time.

Signed-off-by: Alberto Escolar Piedras <[email protected]>

Author: aescolar

tests/drivers/uart/uart_mix_fifo_poll/testcase.yaml

@@ -47,6 +47,7 @@ tests:
       - CONFIG_NRFX_TIMER2=y
       - CONFIG_UART_0_ENHANCED_POLL_OUT=n
       - CONFIG_UART_ASYNC_TX_CACHE_SIZE=2
+    tags: bsim_skip_CI # We skip a few tests to save CI time, as they give little extra coverage
 
   drivers.uart.uart_mix_poll_async_api_low_power:
     extra_configs:
@@ -58,18 +59,21 @@ tests:
       - CONFIG_UART_0_NRF_HW_ASYNC_TIMER=2
       - CONFIG_NRFX_TIMER2=y
       - CONFIG_UART_0_ENHANCED_POLL_OUT=n
+    tags: bsim_skip_CI
 
   drivers.uart.uart_mix_poll_with_ppi:
     extra_configs:
       - CONFIG_UART_INTERRUPT_DRIVEN=n
       - CONFIG_UART_ASYNC_API=n
       - CONFIG_UART_0_ENHANCED_POLL_OUT=y
+    tags: bsim_skip_CI
 
   drivers.uart.uart_mix_poll_fifo_with_ppi:
     extra_configs:
       - CONFIG_UART_INTERRUPT_DRIVEN=y
       - CONFIG_UART_0_INTERRUPT_DRIVEN=y
       - CONFIG_UART_0_ENHANCED_POLL_OUT=y
+    tags: bsim_skip_CI
 
   drivers.uart.uart_mix_poll_async_api_with_ppi:
     extra_configs:
@@ -80,6 +84,7 @@ tests:
       - CONFIG_UART_0_NRF_HW_ASYNC_TIMER=2
       - CONFIG_NRFX_TIMER2=y
       - CONFIG_UART_0_ENHANCED_POLL_OUT=y
+    tags: bsim_skip_CI
 
   drivers.uart.uart_mix_poll_async_api_with_ppi_low_power:
     extra_configs: