File::load calls should be avoided in classes, use dependency injection instead

Kindly review patch.

Provided patch in #2 applied cleanly but still there are error found by phpcs

./vendor/bin/phpcs --standard=Drupal,DrupalPractice --extensions=php,module,inc,install,test,profile,theme,info,txt,md,css,js,yml web/modules/custom/file_browser

FILE: /Users/ashutoshahirwal/Sites/lando/contribution/web/modules/custom/file_browser/js/file_browser.view.js
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FOUND 2 ERRORS AFFECTING 2 LINES
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70 | ERROR | [x] TRUE, FALSE and NULL must be uppercase; expected "TRUE" but found "true"
71 | ERROR | [x] TRUE, FALSE and NULL must be uppercase; expected "TRUE" but found "true"
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PHPCBF CAN FIX THE 2 MARKED SNIFF VIOLATIONS AUTOMATICALLY
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FILE: /Users/ashutoshahirwal/Sites/lando/contribution/web/modules/custom/file_browser/file_browser.module
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FOUND 1 ERROR AFFECTING 1 LINE
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9 | ERROR | [x] Use statements should be sorted alphabetically. The first wrong one is Drupal\Core\Form\FormStateInterface.
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PHPCBF CAN FIX THE 1 MARKED SNIFF VIOLATIONS AUTOMATICALLY
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FILE: /Users/ashutoshahirwal/Sites/lando/contribution/web/modules/custom/file_browser/tests/src/Functional/InstallTest.php
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FOUND 1 ERROR AFFECTING 1 LINE
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20 | ERROR | Do not disable strict config schema checking in tests. Instead ensure your module properly declares its schema for configurations.
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FILE: /Users/ashutoshahirwal/Sites/lando/contribution/web/modules/custom/file_browser/file_browser.install
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FOUND 5 ERRORS AND 1 WARNING AFFECTING 6 LINES
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11 | ERROR | [x] Use statements should be sorted alphabetically. The first wrong one is Drupal\Core\File\FileSystemInterface.
101 | ERROR | [ ] The array declaration extends to column 95 (the limit is 80). The array content should be split up over multiple lines
104 | WARNING | [ ] Unused variable $text.
123 | ERROR | [ ] The array declaration extends to column 95 (the limit is 80). The array content should be split up over multiple lines
223 | ERROR | [ ] The array declaration extends to column 97 (the limit is 80). The array content should be split up over multiple lines
245 | ERROR | [ ] The array declaration extends to column 95 (the limit is 80). The array content should be split up over multiple lines
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PHPCBF CAN FIX THE 1 MARKED SNIFF VIOLATIONS AUTOMATICALLY
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FILE: /Users/ashutoshahirwal/Sites/lando/contribution/web/modules/custom/file_browser/src/Plugin/views/field/FileBrowserPreview.php
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FOUND 1 ERROR AFFECTING 1 LINE
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72 | ERROR | [x] list(...) is forbidden, use [...] instead.
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PHPCBF CAN FIX THE 1 MARKED SNIFF VIOLATIONS AUTOMATICALLY
-----------------------------------------------------------------------------------------------------------------------------------

FILE: /Users/ashutoshahirwal/Sites/lando/contribution/web/modules/custom/file_browser/src/Plugin/Block/ImageEmbedBlock.php
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FOUND 6 ERRORS AND 1 WARNING AFFECTING 7 LINES
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8 | WARNING | [x] Unused use statement
9 | ERROR | [x] Use statements should be sorted alphabetically. The first wrong one is Drupal\Core\Image\ImageFactory.
23 | ERROR | [x] Whitespace found at end of line
38 | ERROR | [ ] Parameter $entity_type_manager is not described in comment
86 | ERROR | [x] Use null coalesce operator instead of ternary operator.
189 | ERROR | [x] Use null coalesce operator instead of ternary operator.
270 | ERROR | [x] Use null coalesce operator instead of ternary operator.
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PHPCBF CAN FIX THE 6 MARKED SNIFF VIOLATIONS AUTOMATICALLY
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Time: 299ms; Memory: 12MB

Hello,
Created a patch based on comment #3. Please review.