Fix eslint/phpcs/phpstan issues

Fixed a few remaining issues but some issues remain
The remaining issues are:

FILE: /eck.module
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FOUND 0 ERRORS AND 2 WARNINGS AFFECTING 2 LINES
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 27 | WARNING | Global constants should not be used, move it to a class or interface
 32 | WARNING | Global constants should not be used, move it to a class or interface
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FILE: src/Form/EntityType/EckEntityTypeFormBase.php
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FOUND 0 ERRORS AND 2 WARNINGS AFFECTING 2 LINES
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  93 | WARNING | \Drupal calls should be avoided in classes, use dependency injection instead
 157 | WARNING | \Drupal calls should be avoided in classes, use dependency injection instead
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FILE: /src/Form/EntityBundle/EckEntityBundleForm.php
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FOUND 0 ERRORS AND 4 WARNINGS AFFECTING 4 LINES
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 110 | WARNING | \Drupal calls should be avoided in classes, use dependency injection instead
 215 | WARNING | \Drupal calls should be avoided in classes, use dependency injection instead
 218 | WARNING | \Drupal calls should be avoided in classes, use dependency injection instead
 281 | WARNING | \Drupal calls should be avoided in classes, use dependency injection instead
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FILE: /README.md
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FOUND 0 ERRORS AND 4 WARNINGS AFFECTING 4 LINES
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 3 | WARNING | Line exceeds 80 characters; contains 84 characters
 4 | WARNING | Line exceeds 80 characters; contains 85 characters
 7 | WARNING | Line exceeds 80 characters; contains 85 characters
 8 | WARNING | Line exceeds 80 characters; contains 85 characters
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FILE: /tests/src/Kernel/EckEntityTest.php
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FOUND 1 ERROR AFFECTING 1 LINE
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 42 | ERROR | The array declaration extends to column 82 (the limit is 80). The array content should be split up over multiple lines
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FILE: /tests/src/Unit/UnitTestBase.php
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FOUND 0 ERRORS AND 2 WARNINGS AFFECTING 2 LINES
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 51 | WARNING | Unused variable $methods.
 81 | WARNING | Unused private method getEntityManagerMock()
----------------------------------------------------------------------------

I have used the following command for checking the Drupal-PHP-CBF/CS issues

vendor/binphpcs --standard=Drupal,DrupalPractice --extensions=php,module,inc,install,test,profile,theme,info,txt,md,yml ./

Please review

Resolved all the issues only the below issues remain.
you can review the updated MR.

FILE: /home/admin1/task/drupal9-os/web/modules/contrib/eck-3422393/tests/src/Unit/UnitTestBase.php
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FOUND 0 ERRORS AND 2 WARNINGS AFFECTING 2 LINES
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51 | WARNING | Unused variable $methods.
81 | WARNING | Unused private method getEntityManagerMock()
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FILE: /home/admin1/task/drupal9-os/web/modules/contrib/eck-3422393/eck.module
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FOUND 0 ERRORS AND 2 WARNINGS AFFECTING 2 LINES
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27 | WARNING | Global constants should not be used, move it to a class or interface
32 | WARNING | Global constants should not be used, move it to a class or interface
-------------------------------------------------------------------------------------

This issue is not just about phpcs issue. As long as eslint/phpcs/phpstan issues are present and the pipeline isn't green, this isn't ready.

Working on it

Fixed phpcs and phpstan error.

All eslint/phpcs/phpstan issues are fixed now. Pipeline is green for eslint/phpcs/phpstan.