[improve] add group convergence strategy name validation

[Duansg]

What's changed?

This PR addresses potential issues currently present in group convergence.

1. Display of empty tags in the current grouping convergence strategy; once saved successfully, they can also participate in the determination.

// verification code
private boolean hasRequiredLabels(Map<String, String> labels, List<String> requiredLabels) {
    return requiredLabels.stream().allMatch(labels::containsKey);
}

2. Input prompts and restriction information overlap.

3. Multiple strategies save invalidation issue.

// Store using the policy name as the key
public void refreshGroupDefines(List<AlertGroupConverge> groupDefines) {
    this.groupDefines.clear();
    groupDefines.forEach(define -> this.groupDefines.put(define.getName(), define));
}

4. Styling issue with excessively long Group Labels

Modification details

• Optimize the display and validation of empty tags.
• Simplify input prompts to prevent style conflicts.
• Optimize the display style of tags on list pages.
• Added test cases and passed successfully.

Checklist

• I have read the Contributing Guide
• I have written the necessary doc or comment.
• I have added the necessary unit tests and all cases have passed.

Add or update API

• I have added the necessary e2e tests and all cases have passed.

[tomsun28]

lgtm!