fix(v10/tanstackstart-react): Reject non-POST requests to the managed tunnel route

[Lms24]

Backport of: #24615

[github-actions]

size-limit report 📦

Path	Size	% Change	Change
@sentry/browser	28.23 kB	added	added
@sentry/browser - with treeshaking flags	26.66 kB	added	added
@sentry/browser (incl. Tracing)	47.12 kB	added	added
@sentry/browser (incl. Tracing + Span Streaming)	48.91 kB	added	added
@sentry/browser (incl. Tracing, Profiling)	51.89 kB	added	added
@sentry/browser (incl. Tracing, Replay)	86.4 kB	added	added
@sentry/browser (incl. Tracing, Replay) - with treeshaking flags	76.06 kB	added	added
@sentry/browser (incl. Tracing, Replay with Canvas)	91.13 kB	added	added
@sentry/browser (incl. Tracing, Replay, Feedback)	103.76 kB	added	added
@sentry/browser (incl. Feedback)	45.39 kB	added	added
@sentry/browser (incl. sendFeedback)	33.03 kB	added	added
@sentry/browser (incl. FeedbackAsync)	38.16 kB	added	added
@sentry/browser (incl. Metrics)	29.31 kB	added	added
@sentry/browser (incl. Logs)	29.54 kB	added	added
@sentry/browser (incl. Metrics & Logs)	30.23 kB	added	added
@sentry/react	30.02 kB	added	added
@sentry/react (incl. Tracing)	49.43 kB	added	added
@sentry/vue	33.66 kB	added	added
@sentry/vue (incl. Tracing)	49.13 kB	added	added
@sentry/svelte	28.25 kB	added	added
CDN Bundle	30.58 kB	added	added
CDN Bundle (incl. Tracing)	49.07 kB	added	added
CDN Bundle (incl. Logs, Metrics)	32.16 kB	added	added
CDN Bundle (incl. Tracing, Logs, Metrics)	50.39 kB	added	added
CDN Bundle (incl. Replay, Logs, Metrics)	71.5 kB	added	added
CDN Bundle (incl. Tracing, Replay)	86.67 kB	added	added
CDN Bundle (incl. Tracing, Replay, Logs, Metrics)	87.93 kB	added	added
CDN Bundle (incl. Tracing, Replay, Feedback)	92.48 kB	added	added
CDN Bundle (incl. Tracing, Replay, Feedback, Logs, Metrics)	93.75 kB	added	added
CDN Bundle - uncompressed	90.96 kB	added	added
CDN Bundle (incl. Tracing) - uncompressed	147.96 kB	added	added
CDN Bundle (incl. Logs, Metrics) - uncompressed	95.67 kB	added	added
CDN Bundle (incl. Tracing, Logs, Metrics) - uncompressed	151.94 kB	added	added
CDN Bundle (incl. Replay, Logs, Metrics) - uncompressed	220.63 kB	added	added
CDN Bundle (incl. Tracing, Replay) - uncompressed	267.39 kB	added	added
CDN Bundle (incl. Tracing, Replay, Logs, Metrics) - uncompressed	271.35 kB	added	added
CDN Bundle (incl. Tracing, Replay, Feedback) - uncompressed	281.09 kB	added	added
CDN Bundle (incl. Tracing, Replay, Feedback, Logs, Metrics) - uncompressed	285.04 kB	added	added
@sentry/nextjs (client)	51.96 kB	added	added
@sentry/sveltekit (client)	47.57 kB	added	added
@sentry/core/server	81.14 kB	added	added
@sentry/core/browser	67.27 kB	added	added
@sentry/node-core	63.84 kB	added	added
@sentry/node	126.55 kB	added	added
@sentry/node (incl. diagnostics channel injection)	170.69 kB	added	added
@sentry/node/import (ESM hook with diagnostics-channel injection)	166 B	added	added
@sentry/node/light	51.95 kB	added	added
@sentry/node - without tracing	75.61 kB	added	added
@sentry/aws-serverless	84.79 kB	added	added
@sentry/cloudflare (withSentry) - minified	204.66 kB	added	added
@sentry/cloudflare (withSentry)	504.61 kB	added	added