Disable create new version button while handling submit

[Jithmi004]

Purpose

In publisher portal, clicking the "Create" button in the "Create New Version" page more than once during the process leads to duplicate entries.
Related to - wso2/api-manager#3256

Approach

To disable the "Create" button during the API version creation process, a new state isLoading is introduced to the CreateNewVersion component. Initially, isLoading is set to false. When the handleSubmit method is triggered, isLoading is set to true, which disables the "Create" button, preventing multiple submissions. After the API request completes, whether successfully or with an error, isLoading is reset to false, re-enabling the button.

[sonarcloud]

Quality Gate passed

Issues
0 New issues
0 Accepted issues

Measures
0 Security Hotspots
0.0% Coverage on New Code
75.0% Duplication on New Code

See analysis details on SonarCloud