fix(core): observer remove unregisterOnNextCall

[Dushusir]

How to test?

const activeSheet = univerAPI.getActiveWorkbook()?.getActiveSheet();
univerAPI.getSheetHooks().onCellDrop((cell) => {
    console.log('onCellDrop', cell);
    if (cell?.location.row !== undefined && cell?.location.col !== undefined) {
        const range = activeSheet?.getRange(cell?.location.row, cell?.location.col, 1, 1);
        if (range) {
            range.setValue('Dropped');
        }
    }
});

Pull Request Checklist

• Related tickets or issues have been linked in the PR description (or missing issue).
• Naming convention is followed (do please check it especially when you created new plugins, commands and resources).
• Unit tests have been added for the changes (if applicable).
• Breaking changes have been documented (or no breaking changes introduced in this PR).

[codecov]

Codecov Report

Attention: Patch coverage is 50.00000% with 2 lines in your changes are missing coverage. Please review.

Project coverage is 30.15%. Comparing base (5cc6881) to head (6532216).

Files	Patch %	Lines
packages/slides/src/views/render/canvas-view.ts	0.00%	2 Missing ⚠️

Additional details and impacted files

@@            Coverage Diff             @@
##              dev    #2334      +/-   ##
==========================================
+ Coverage   30.05%   30.15%   +0.10%     
==========================================
  Files        1421     1421              
  Lines       73107    73076      -31     
  Branches    15317    15308       -9     
==========================================
+ Hits        21975    22039      +64     
+ Misses      51132    51037      -95     

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[github-actions]

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