Replaces sasslint to stylelint to conform to changes in core dashboards

[DarshitChanpura]

Testing

run yarn lint. It should pass without any errors

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[peternied]

@DarshitChanpura The CI checks are failing because of Error: Cannot find module '/home/runner/work/security-dashboards-plugin/security-dashboards-plugin/OpenSearch-Dashboards/scripts/stylelint' is this something that you can fix independent of moving to the new dashboard version?

[DarshitChanpura]

@DarshitChanpura The CI checks are failing because of Error: Cannot find module '/home/runner/work/security-dashboards-plugin/security-dashboards-plugin/OpenSearch-Dashboards/scripts/stylelint' is this something that you can fix independent of moving to the new dashboard version?

Good Point! I think I will have to merge these changes in version bump PR and move forward from there

[DarshitChanpura]

Closing this PR now as these changes are covered in #928