Fix code sniffer warnings & errors

Code sniffer gives a bunch of errors & warnings:

~/S/n/w/m/c/flood_unblock ❯❯❯ fin phpcs cs ./ ✘ 1

FILE: /var/www/web/modules/contrib/flood_unblock/flood_unblock.module
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FOUND 2 ERRORS AND 2 WARNINGS AFFECTING 4 LINES
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1 | ERROR | [x] Missing file doc comment
20 | WARNING | [ ] Only string literals should be passed to t() where possible
35 | ERROR | [x] Expected 1 space after "="; 2 found
57 | WARNING | [x] A comma should follow the last multiline array item. Found: )
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PHPCBF CAN FIX THE 3 MARKED SNIFF VIOLATIONS AUTOMATICALLY
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FILE: /var/www/web/modules/contrib/flood_unblock/tests/src/Functional/FloodUnblockUiPageTest.php
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FOUND 8 ERRORS AFFECTING 8 LINES
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3 | ERROR | [x] There must be one blank line after the namespace declaration
25 | ERROR | [ ] Missing @var tag in member variable comment
26 | ERROR | [ ] Class property $admin_user should use lowerCamel naming without underscores
30 | ERROR | [ ] Missing @var tag in member variable comment
31 | ERROR | [ ] Class property $simple_user should use lowerCamel naming without underscores
33 | ERROR | [x] Missing function doc comment
45 | ERROR | [x] Missing function doc comment
56 | ERROR | [x] Missing function doc comment
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PHPCBF CAN FIX THE 4 MARKED SNIFF VIOLATIONS AUTOMATICALLY
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FILE: /var/www/web/modules/contrib/flood_unblock/src/FloodUnblockManager.php
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FOUND 17 ERRORS AFFECTING 15 LINES
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12 | ERROR | [x] Missing class doc comment
17 | ERROR | [x] Doc comment short description must end with a full stop
23 | ERROR | [ ] Missing short description in doc comment
28 | ERROR | [ ] Missing short description in doc comment
33 | ERROR | [ ] Missing short description in doc comment
45 | ERROR | [ ] Parameter $flood is not described in comment
45 | ERROR | [ ] Parameter $configFactory is not described in comment
45 | ERROR | [ ] Parameter $messenger is not described in comment
48 | ERROR | [ ] Missing parameter comment
49 | ERROR | [ ] Missing parameter comment
65 | ERROR | [ ] Public method name "FloodUnblockManager::get_blocked_ip_entries" is not in lowerCamel format
107 | ERROR | [ ] Public method name "FloodUnblockManager::get_blocked_user_entries" is not in lowerCamel format
141 | ERROR | [x] Expected newline after closing brace
163 | ERROR | [ ] Public method name "FloodUnblockManager::flood_unblock_clear_event" is not in lowerCamel format
175 | ERROR | [x] Expected newline after closing brace
182 | ERROR | [x] Expected 1 blank line after function; 0 found
183 | ERROR | [x] The closing brace for the class must have an empty line before it
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PHPCBF CAN FIX THE 6 MARKED SNIFF VIOLATIONS AUTOMATICALLY
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FILE: /var/www/web/modules/contrib/flood_unblock/src/Commands/FloodUnblockCommands.php
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FOUND 4 ERRORS AFFECTING 4 LINES
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12 | ERROR | [x] Opening brace should be on the same line as the declaration
14 | ERROR | [ ] Missing short description in doc comment
15 | ERROR | [x] Data types in @var tags need to be fully namespaced
22 | ERROR | [ ] Missing parameter comment
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PHPCBF CAN FIX THE 2 MARKED SNIFF VIOLATIONS AUTOMATICALLY
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FILE: /var/www/web/modules/contrib/flood_unblock/src/Form/FloodUnblockAdminForm.php
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FOUND 6 ERRORS AND 1 WARNING AFFECTING 7 LINES
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10 | WARNING | [x] Unused use statement
17 | ERROR | [ ] Missing short description in doc comment
22 | ERROR | [ ] Missing short description in doc comment
27 | ERROR | [x] Missing function doc comment
119 | ERROR | [x] Expected 1 blank line after function; 2 found
159 | ERROR | [x] Expected 1 blank line after function; 0 found
160 | ERROR | [x] The closing brace for the class must have an empty line before it
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PHPCBF CAN FIX THE 5 MARKED SNIFF VIOLATIONS AUTOMATICALLY
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Time: 4.21 secs; Memory: 10MB