feat: add isSubmitSuccessful prop

[s-coimbra21]

This adds a new prop the form state called isSubmitSuccessful. My use case for this is that there is no good way to keep input/submission disabled when a form that calls a server action which redirects the user when the form is successful.

[crutchcorn]

Awesome work, great value add!

[nx-cloud]

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nx affected --targets=test:sherif,test:knip,tes...	✅ Succeeded	2m 15s	View ↗
nx run-many --target=build --exclude=examples/**	✅ Succeeded	22s	View ↗

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☁️ Nx Cloud last updated this comment at 2025-03-01 10:35:29 UTC

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commit: c553f73

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 88.68%. Comparing base (faea151) to head (c553f73).
Report is 7 commits behind head on main.

Additional details and impacted files

@@            Coverage Diff             @@
##             main     #919      +/-   ##
==========================================
+ Coverage   88.50%   88.68%   +0.17%     
==========================================
  Files          28       28              
  Lines        1253     1255       +2     
  Branches      327      327              
==========================================
+ Hits         1109     1113       +4     
+ Misses        129      127       -2     
  Partials       15       15              

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