test: updated themeCommands (#33632)

RCA: There are many unused commands within themeCommands.js file

Solution:
Checked the themeCommands in both CE and EE repository and we are
removing those commands which are not used in any tests as part of
cleanup activity

/ok-to-test tags="@tag.All"<!-- This is an auto-generated comment:
Cypress test results -->
> [!TIP]
> 🟢 🟢 🟢 All cypress tests have passed! 🎉 🎉 🎉
> Workflow run:
<https://github.com/appsmithorg/appsmith/actions/runs/9184741418>
> Commit: 84481f0
> Cypress dashboard url: <a
href="https://internal.appsmith.com/app/cypress-dashboard/rundetails-65890b3c81d7400d08fa9ee5?branch=master&workflowId=9184741418&attempt=1"
target="_blank">Click here!</a>

<!-- end of auto-generated comment: Cypress test results  -->

app/client/cypress/support/themeCommands.js

@@ -15,12 +15,6 @@ Cypress.Commands.add("borderMouseover", (index, text) => {
  cy.get(themelocator.popover).contains(text);
 });
 
-Cypress.Commands.add("shadowMouseover", (text) => {
- cy.xpath(theme.locators._boxShadow(text)).trigger("mouseover");
- cy.wait(1000);
- cy.get(themelocator.popover).contains(text);
-});
-
 Cypress.Commands.add("colorMouseover", (index, text) => {
  let colorType =
  index == 0