test: updated tests for checkboxgroup (#35945)

RCA:
Test was failing after removing retry, the issue was it was clicking on
a checkbox which was not required.
the retry actually was bringing back the system to right state by
clicking again.

Solution:
We removed the step that was unnecessary in this case which resolved the
issue
EE: appsmithorg/appsmith-ee#4992

/ok-to-test tags="@tag.Sanity"

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> 🟢 🟢 🟢 All cypress tests have passed! 🎉 🎉 🎉
> Workflow run:
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> Commit: e599c6d
> <a
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> Tags: `@tag.Sanity`
> Spec:
> <hr>Thu, 29 Aug 2024 14:33:59 UTC
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---------

Co-authored-by: karthik <[email protected]>

app/client/cypress/e2e/Regression/ClientSide/Widgets/Checkbox/CheckboxGroup2_spec.js

@@ -77,8 +77,6 @@ describe(
     it("3. handleSelectAllChange: unchecked", function () {
       const selectAllSelector = formWidgetsPage.selectAllCheckboxControl;
       const uncheckedOptionInputs = `${formWidgetsPage.checkboxGroupOptionInputs} input:not(:checked)`;
-      // Deselect all
-      cy.get(selectAllSelector).click();
       // Should get 2 unchecked option inputs
       cy.get(uncheckedOptionInputs).should("have.length", 2);
       //handleSelectAllChange: checked", function () {