bug(mat-table): Table not refreshing on nested detail-row column change

### Is this a regression?

- [ ] Yes, this behavior used to work in the previous version

### The previous version in which this bug was not present was

_No response_

### Description

I'm not sure if this scenario is supported by the API at all but imho it should be a valid scenario.

If I have an array of detail rows changing their columns does not automatically redraw the table. If I know all the rows in advance (do not use `@for`) it works as expected.

### Reproduction

StackBlitz link: https://stackblitz.com/edit/av2ud5lm

Steps to reproduce:
1. Clicking **Toggle Secondary** changes the json-output but not the table
2. Only on clicking **Toggle Primary** the table gets redrawn, respecting the current definition for the detail rows

Working StackBlitz link: https://stackblitz.com/edit/av2ud5lm-ardwk8i8
Just to make sure this also happens if all the rows are in a single array (https://stackblitz.com/edit/av2ud5lm-yhdxrfqp)

Not this being a Q/A but just out of curiosity, why do I need `multiTemplateDataRows` at all? Why won't all (matching) rows get displayed by default? Asking since I tend to always use / set it but guess there might be some kind of disadvantage since this is not the default behavior?

### Expected Behavior

Even generic detail rows (created by `@for`) should behave correct.

### Actual Behavior

Right now, I need to know all my detail rows in advance. Since I'm implementing a pretty customizable table, I want to let the user create / define the rows in runtime.

If you're not going to support this case officially, a neat workaround to trigger redrawing the table would be welcome.

### Environment

Angular CLI: 19.1.9
Node: 22.11.0
Package Manager: pnpm 10.6.2
OS: win32 x64

Angular: 19.1.8
... animations, common, compiler, compiler-cli, core, forms
... platform-browser, platform-browser-dynamic, router
... service-worker

Package Version
-----------------------------------------------------------
@angular-devkit/architect 0.1901.9 (cli-only)
@angular-devkit/build-angular 19.1.9
@angular-devkit/core 19.1.9 (cli-only)
@angular-devkit/schematics 19.1.9 (cli-only)
@angular/cdk 19.1.5
@angular/cli 19.1.9
@angular/material 19.1.5
@angular/material-luxon-adapter 19.1.5
@schematics/angular 19.1.9 (cli-only)
rxjs 7.8.2
typescript 5.7.3
zone.js 0.15.0

主要な StackBlitz 再現を実行し、動作するリンクと比較します。その際、@for で作成された mat-table の詳細行と、Toggle Secondary/Toggle Primary の動作に注目してください。multiTemplateDataRows が実行時の列変更にどのように応答するかを追跡します。Toggle Secondary の後にテーブルが再描画されるか、シナリオがサポートされていない場合に文書化された回避策が提供されれば完了です。

索引モデルが issue の本文から書いたものです。