Fix issues reported by phpcs and enable gitlab pipeline

Problem/Motivation

I ran this following phpcs command and errors were reported below.

phpcs \
--standard=Drupal,DrupalPractice -n \
--extensions=php,module,inc,install,test,profile,theme,css,info,txt,md,yml,twig \
--ignore="*.features.*,*.pages*.inc,*/node_modules/*" \
custom_view_filters/

FILE: /custom_view_filters/src/Plugin/views/filter/DateRangePickerFilter.php
-------------------------------------------------------------------------------------------------------------------------------------
FOUND 10 ERRORS AFFECTING 10 LINES
-------------------------------------------------------------------------------------------------------------------------------------
   7 | ERROR | [x] Use statements should be sorted alphabetically. The first wrong one is
     |       |     Drupal\views\Plugin\views\display\DisplayPluginBase.
  52 | ERROR | [x] Use null coalesce operator instead of ternary operator.
  58 | ERROR | [x] Use null coalesce operator instead of ternary operator.
  90 | ERROR | [x] Expected 1 blank line after function; 2 found
 111 | ERROR | [x] Expected 1 blank line after function; 2 found
 117 | ERROR | [ ] Missing parameter type
 119 | ERROR | [ ] Missing parameter type
 215 | ERROR | [x] Use null coalesce operator instead of ternary operator.
 221 | ERROR | [x] Use null coalesce operator instead of ternary operator.
 247 | ERROR | [x] Use null coalesce operator instead of ternary operator.
-------------------------------------------------------------------------------------------------------------------------------------
PHPCBF CAN FIX THE 8 MARKED SNIFF VIOLATIONS AUTOMATICALLY
-------------------------------------------------------------------------------------------------------------------------------------


FILE: /custom_view_filters/src/Plugin/views/filter/CustomAzFilter.php
-------------------------------------------------------------------------------------------------------------------------------------
FOUND 3 ERRORS AFFECTING 3 LINES
-------------------------------------------------------------------------------------------------------------------------------------
   7 | ERROR | [x] Use statements should be sorted alphabetically. The first wrong one is
     |       |     Drupal\views\Plugin\views\display\DisplayPluginBase.
 211 | ERROR | [x] Use null coalesce operator instead of ternary operator.
 238 | ERROR | [x] Use null coalesce operator instead of ternary operator.
-------------------------------------------------------------------------------------------------------------------------------------
PHPCBF CAN FIX THE 3 MARKED SNIFF VIOLATIONS AUTOMATICALLY
-------------------------------------------------------------------------------------------------------------------------------------


FILE: /custom_view_filters/src/Plugin/views/filter/NodeGranularDateFilter.php
-------------------------------------------------------------------------------------------------------------------------------------
FOUND 10 ERRORS AFFECTING 10 LINES
-------------------------------------------------------------------------------------------------------------------------------------
   7 | ERROR | [x] Use statements should be sorted alphabetically. The first wrong one is
     |       |     Drupal\views\Plugin\views\display\DisplayPluginBase.
 167 | ERROR | [x] Parameter comment must end with a full stop
 179 | ERROR | [ ] Missing parameter type
 181 | ERROR | [ ] Missing parameter type
 200 | ERROR | [x] Expected 1 space after "="; 2 found
 290 | ERROR | [x] Use null coalesce operator instead of ternary operator.
 297 | ERROR | [x] Use null coalesce operator instead of ternary operator.
 325 | ERROR | [x] Use null coalesce operator instead of ternary operator.
 329 | ERROR | [x] Short array syntax must be used to define arrays
 337 | ERROR | [x] Short array syntax must be used to define arrays
-------------------------------------------------------------------------------------------------------------------------------------
PHPCBF CAN FIX THE 8 MARKED SNIFF VIOLATIONS AUTOMATICALLY
-------------------------------------------------------------------------------------------------------------------------------------

Time: 166ms; Memory: 12MB

I've uploaded a patch to fix these phpcs errors reported.