Fix eslint errors [#3504105]

Problem/Motivation

Since drupal template gitlab-ci has been added, several eslint errors are poping.

Steps to reproduce

Proposed resolution

Remaining tasks

Fix eslint errors - https://git.drupalcode.org/issue/commerce_step_panes-3504079/-/jobs/4229648

Remaining errors:

  30:40  warning  Too many nested callbacks (4). Maximum allowed is 3  max-nested-callbacks
  31:17  error    Unexpected use of '&='                               no-bitwise
  42:28  warning  Too many nested callbacks (4). Maximum allowed is 3  max-nested-callbacks
  43:49  warning  Too many nested callbacks (5). Maximum allowed is 3  max-nested-callbacks

✖ 4 problems (1 error, 3 warnings)

User interface changes

API changes

Data model changes

Issue fork commerce_step_panes-3504105

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3504105-fix-eslint-errors changes, plain diff MR !4
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