feat(tanstackstart-react): Add file exclude to configure middleware auto-instrumentation

[nicohrubec]

Depends on (i.e. do not review until the following PR is merged): #19001

This PR extends the autoInstrumentMiddleware option to support fine-grained control over which files are auto-instrumented. Previously, this option only supported a boolean setting. Now you can pass an object with an exclude array to selectively skip specific files from auto-instrumentation.

// vite.config.ts                                                                                                                                                                     
  import { sentryTanstackStart } from '@sentry/tanstackstart-react';                                                                                                                    
                                                                                                                                                                                        
  export default defineConfig({                                                                                                                                                         
    plugins: [                                                                                                                                                                          
      sentryTanstackStart({                                                                                                                                                             
        autoInstrumentMiddleware: {                                                                                                                                                     
          exclude: [                                                                                                                                                                                       
            /\.test\.tsx?$/,        // Skip test files                                                                                                                                  
          ],                                                                                                                                                                            
        },                                                                                                                                                                              
      }),                                                                                                                                                                               
    ],                                                                                                                                                                                  
  }); 

Closes #18985

[github-actions]

node-overhead report 🧳

Note: This is a synthetic benchmark with a minimal express app and does not necessarily reflect the real-world performance impact in an application.

Scenario	Requests/s	% of Baseline	Prev. Requests/s	Change %
GET Baseline	8,673	-	9,277	-7%
GET With Sentry	1,641	19%	1,793	-8%
GET With Sentry (error only)	6,045	70%	6,303	-4%
POST Baseline	1,173	-	1,199	-2%
POST With Sentry	569	49%	613	-7%
POST With Sentry (error only)	1,045	89%	1,064	-2%
MYSQL Baseline	3,324	-	3,382	-2%
MYSQL With Sentry	455	14%	507	-10%
MYSQL With Sentry (error only)	2,683	81%	2,727	-2%

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