fix(module: form): fix the form component modifies the bound model to throw an exception in Rule validation mode

[lxyruanjian]

🤔 This is a ...

• New feature
• Bug fix
• Site / documentation update
• Demo update
• Component style update
• Bundle size optimization
• Performance optimization
• Refactoring
• Code style optimization
• Test Case
• Branch merge
• Other (about what?)

🔗 Related issue link

Fixes #1990

💡 Background and solution

The form component removes the formItem when it is disposed.

IForm.cs Add RemoveFormItem method:

internal void RemoveFormItem(IFormItem formItem);

Form.razor.cs Implementation IForm RemoveFormItem method:

void IForm.RemoveFormItem(IFormItem formItem)
{
    _formItems.Remove(formItem);
}

FormItem.razor.cs Call Form RemoveFormItem method on Dispose

protected override void Dispose(bool disposing)
{
    if (CurrentEditContext != null && _validationStateChangedHandler != null)
    {
        CurrentEditContext.OnValidationStateChanged -= _validationStateChangedHandler;
    }

    Form?.RemoveFormItem(this);

    base.Dispose(disposing);
}

📝 Changelog

Language	Changelog
🇺🇸 English
🇨🇳 Chinese

☑️ Self Check before Merge

⚠️ Please check all items below before review. ⚠️

• Doc is updated/provided or not needed
• Demo is updated/provided or not needed
• Changelog is provided or not needed

[github-actions]

[dnfadmin]

All CLA requirements met.

[ElderJames]

LGTM

[codecov]

Codecov Report

Merging #1901 (6ed0812) into master (ad2c045) will increase coverage by 23.50%.
The diff coverage is 0.00%.

@@             Coverage Diff             @@
##           master    #1901       +/-   ##
===========================================
+ Coverage    0.00%   23.50%   +23.50%     
===========================================
  Files         479      496       +17     
  Lines       31330    23361     -7969     
  Branches        0      122      +122     
===========================================
+ Hits            0     5492     +5492     
+ Misses      31330    17866    -13464     
- Partials        0        3        +3     

Impacted Files	Coverage Δ
components/form/Form.razor.cs	0.00% <0.00%> (ø)
components/form/FormItem.razor.cs	0.00% <0.00%> (ø)
components/card/Card.razor	0.00% <0.00%> (ø)
components/form/Form.razor	0.00% <0.00%> (ø)
components/rate/Rate.razor	0.00% <0.00%> (ø)
components/spin/Spin.razor	0.00% <0.00%> (ø)
components/tree/Tree.razor	0.00% <0.00%> (ø)
components/menu/MenuLink.cs	0.00% <0.00%> (ø)
components/menu/MenuMode.cs	0.00% <0.00%> (ø)
components/steps/Step.razor	0.00% <0.00%> (ø)
... and 440 more

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