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

Run the primary StackBlitz reproduction and compare it with the working links, focusing on mat-table detail rows created with @for and the Toggle Secondary/Toggle Primary behavior. Trace how multiTemplateDataRows responds to runtime column changes. Done means the table redraws after Toggle Secondary, or a documented workaround is provided if the scenario is unsupported.

Written by the indexing model from the issue text.