Code Quality Issues

Several issues coming out of PHPCS with the current code, and the module is not D9 compatible.

FILE: src/Form/AWSConnectorForm.php
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FOUND 0 ERRORS AND 3 WARNINGS AFFECTING 2 LINES
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 80 | WARNING | [x] There must be no blank line following an inline comment
 80 | WARNING | [ ] There must be no blank line following an inline comment
 82 | WARNING | [ ] \Drupal calls should be avoided in classes, use dependency injection instead
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PHPCBF CAN FIX THE 1 MARKED SNIFF VIOLATIONS AUTOMATICALLY
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FILE: src/Credentials/AWSCredentialProvider.php
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FOUND 2 ERRORS AND 2 WARNINGS AFFECTING 4 LINES
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  19 | ERROR   | Doc comment short description must be on a single line, further text should be a
     |         | separate paragraph
  33 | WARNING | Unused bound variable $filename.
  77 | ERROR   | Doc comment short description must be on a single line, further text should be a
     |         | separate paragraph
 124 | WARNING | Unused variable $result.
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