bug(MatTable): Nested MatTable's rows have no border if I expand last row of parent MatTable

### 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

When I have a nested MatTable set with expand feature, when I expand the last row of the parent table, all the cells in the child MatTable will have no border.

But If I am expanding any other rows except the last row, the nested MatTable is displaying fine.

I have found the reason that the styles from last row .mat-cell of the parent MatTable is being applied to all the child MatTable's .mat-cell


### Reproduction

StackBlitz link: https://stackblitz.com/edit/5djdhn?file=src%2Fexample%2Ftable-expandable-rows-example.ts
Steps to reproduce:
1. Expand the 1st row of the MatTable and check row borders
2. Expand the last row of the MatTable and checkl the absence of row borders of the rows

### Expected Behavior

Only the last row of the nested MatTable will be applied with the `border-bottom: none` styles. not all the rows

### Actual Behavior

Every row inside the last row of MatTable's child MatTable is applied with `border-bottom: none` styles.

### Environment

Angular CLI: 17.0.1
Node: 18.19.0
Package Manager: npm 10.2.3
OS: win32 x64

Angular: 17.0.3
... animations, common, compiler, compiler-cli, core, forms
... platform-browser, platform-browser-dynamic, router

Package Version
-----------------------------------------------------------
@angular-devkit/architect 0.1700.1
@angular-devkit/build-angular 17.0.1
@angular-devkit/core 17.0.1
@angular-devkit/schematics 17.0.1
@angular/cdk 17.0.1
@angular/cli 17.0.1
@angular/material 17.0.1
@angular/material-luxon-adapter 17.0.1
@schematics/angular 17.0.1
rxjs 7.8.1
typescript 5.2.2
zone.js 0.14.2

从 src/example/table-expandable-rows-example.ts 中的 StackBlitz 入口点开始，通过先展开第一行、再展开最后一行来重现问题。检查嵌套的 MatTable 行如何继承父表最后一行的边框样式。完成的标准是只有嵌套表的最后一行具有 border-bottom: none，而其他子行保留其边框。

由索引模型根据 Issue 内容生成。