Disable Gitconfig Save button if config has not changed

[vinokurig]

What does this PR do?

Add a check that compared stored and new gitconfig data on input. If the entered gitconfig data matches with stored data, disable the Save button.

Screenshot/screencast of this PR

What issues does this PR fix or reference?

fixes eclipse-che/che#23625

Is it tested? How?

1. Apply the dashboard pull request image: quay.io/eclipse/che-dashboard:pr-
2. Go to User Preferences dialog -> Gitconfig tab.
3. Enter username and email if empty, store the new data, see: the Save button is disabled.
4. Change the gitconfig data, username or email, see: the Save button is enabled.

Release Notes

Docs PR

[openshift-ci]

[APPROVALNOTIFIER] This PR is NOT APPROVED

This pull-request has been approved by: vinokurig

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[che-bot]

Click here to review and test in web IDE:

[github-actions]

Docker image build succeeded: quay.io/eclipse/che-dashboard:pr-1426

kubectl patch command

kubectl patch -n eclipse-che "checluster/eclipse-che" --type=json -p="[{"op": "replace", "path": "/spec/components/dashboard/deployment", "value": {containers: [{image: "quay.io/eclipse/che-dashboard:pr-1426", name: che-dashboard}]}}]"

[codecov]

Codecov Report

❌ Patch coverage is 75.00000% with 3 lines in your changes missing coverage. Please review.
✅ Project coverage is 92.12%. Comparing base (3ad6fa5) to head (070398e).
⚠️ Report is 1 commits behind head on main.

Files with missing lines	Patch %	Lines
...src/pages/UserPreferences/GitConfig/Form/index.tsx	75.00%	3 Missing ⚠️

Additional details and impacted files

@@            Coverage Diff             @@
##             main    #1426      +/-   ##
==========================================
- Coverage   92.23%   92.12%   -0.12%     
==========================================
  Files         511      511              
  Lines       47614    47639      +25     
  Branches     3438     3432       -6     
==========================================
- Hits        43918    43888      -30     
- Misses       3657     3711      +54     
- Partials       39       40       +1     

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