Added loader in UserManagement modal.

[aryan-bhokare]

closes #4449

Proposed changes

Added a Loader in all the User Management modals based on the Loading of the query mutations.
Following includes the changes:

1. Account Details Change
2. Account Password Change
3. Create New Token 
4. Delete token
5. Create New User
6. Enable Disable User
7. ResetPassword

Types of changes

What types of changes does your code introduce to Litmus? Put an x in the boxes that apply

• New feature (non-breaking change which adds functionality)
• Bugfix (non-breaking change which fixes an issue)
• Breaking change (fix or feature that would cause existing functionality to not work as expected)
• Documentation Update (if none of the other choices applies)

Checklist

Put an x in the boxes that apply. You can also fill these out after creating the PR. If you're unsure about any of them, don't hesitate to ask. We're here to help! This is simply a reminder of what we are going to look for before merging your code.

• I have read the CONTRIBUTING doc
• I have signed the commit for DCO to be passed.
• Lint and unit tests pass locally with my changes
• I have added tests that prove my fix is effective or that my feature works (if appropriate)
• I have added necessary documentation (if appropriate)

Special notes for your reviewer:

ScreenCast:

usermanagementloader.mp4

[aryan-bhokare]

Final change

buttonloader.mp4

[hrishavjha]

LGTM, thanks for the changes 🚀

[aryan-bhokare]

LGTM, thanks for the changes 🚀

Thanks for the review!

[namkyu1999]

Can you check build-pipeline / web-unit-tests (pull_request)?

[aryan-bhokare]

Can you check build-pipeline / web-unit-tests (pull_request)?

fixed the error.

[namkyu1999]

LGTM 🚀