chore: Removed ShareApp Boolean Field (#20291)

## Description
> This PR removes the Boolean shareApp field from the Application Model

Fixes #20261 


## Type of change
- Chore (housekeeping or task changes that don't impact user perception)


## How Has This Been Tested?
- Manual

## Checklist:
### Dev activity
- [x] My code follows the style guidelines of this project
- [x] I have performed a self-review of my own code
- [ ] I have commented my code, particularly in hard-to-understand areas
- [ ] I have made corresponding changes to the documentation
- [x] My changes generate no new warnings
- [ ] I have added tests that prove my fix is effective or that my
feature works
- [x] New and existing unit tests pass locally with my changes
- [ ] PR is being merged under a feature flag


### QA activity:
- [ ] Test plan has been approved by relevant developers
- [ ] Test plan has been peer reviewed by QA
- [ ] Cypress test cases have been added and approved by either SDET or
manual QA
- [ ] Organized project review call with relevant stakeholders after
Round 1/2 of QA
- [ ] Added Test Plan Approved label after reveiwing all Cypress test

app/server/appsmith-server/src/main/java/com/appsmith/server/domains/Application.java

@@ -305,7 +305,6 @@ public class Application extends BaseDomain {
         private String logoAssetId;
         private String logoConfiguration;
         private Boolean showSignIn;
-        private Boolean showShareApp;
     }
 
     public AppPositioning getAppPositioning() {