Migrate batch-operation-spec.js tests into TestCafe

[gbetances089]

Tests path

Feature: Cockpit Batch Operation Spec Tests:

• should go to process dashboard and check if batch operation button is available.
• should go to batch operation page

Feature: Define Operation Page Tests:

• should have selected no operation initially.
• should have several operations.
• should list the filter results in a table.
• should have sortable table columns.
• should have a disabled confirm button as long no operation is selected.

[gbetances089]

Related to https://github.com/camunda/camunda-bpm-platform-ee/pull/940

[gbetances089]

For Tests:

• should go to process dashboard and check if batch operation button is available.
• should go to batch operation page

I added a new test which is coming on this PR

For Tests:

• should have selected no operation initially.
• should have several operations.
• should list the filter results in a table.
• should have sortable table columns.
• should have a disabled confirm button as long no operation is selected.

These are all cover already on this PR with both E2E and visual tests