fix: prevent telemetry interceptor from masking transport errors in extendToM365 (cherry-pick to dev)

[Alive-Fish]

Cherry-pick of #15782 (release/6.9 → dev).

Summary

Fixes AB#37640864.

When provision runs teamsApp/extendToM365 under network latency, the user sees a misleading error:

Cannot read properties of undefined (reading 'toUpperCase')

instead of the real MOS/network failure (TLS handshake, ECONNRESET, "socket hang up", etc.).

Root cause

The Axios telemetry interceptor WrappedAxiosClient.onRejected calls convertUrlToApiName(fullPath, method), which does method.toUpperCase(). For low-level transport errors, error.request.method is often undefined, so the interceptor itself throws a synthetic TypeError that propagates out of PackageService and replaces the real error.

PR #15676 (keepAlive + 3-attempt retry on extendToM365) is what surfaced this latent bug:

• keepAlive: true reuses sockets that the server may have silently closed, producing exactly the "method undefined" class of AxiosError.
• After 3 retries, the final transport error hits the interceptor and the masking TypeError is thrown — matching the bug report's "failed by retry 3 times".

Changes

packages/fx-core/src/common/wrappedAxiosClient.ts

• Wrap entire onRejected body in try { … } catch {} so telemetry can never replace the original error.
• Guard error.request?.method/host/path.
• Guard method.toUpperCase() in convertUrlToApiName and convertMethodUrlToApiDefForMOS.
• Tolerate non-object error.response.data (e.g. HTML 502 body) in the MOS branch.
• Make error.response.headers[CORRELATION_ID] lookup safe when headers is missing.

packages/fx-core/tests/common/wrappedAxiosClient.test.ts

• Add 10 regression tests covering: undefined request.method, missing request object, string response.data, AppStudio TDP error without headers, MOS error with nested response.data.error, MOS error with empty inner error fields, telemetry-reporter throwing (outer try/catch), and minimal error shape.

Testing

All 25 wrappedAxiosClient.test.ts tests pass. Branch coverage on the changed file: 95.9%; line coverage: 100%.

Bug: AB#37640864
Related: #15676, #15782

[codecov]

Codecov Report

❌ Patch coverage is 97.29730% with 1 line in your changes missing coverage. Please review.
✅ Project coverage is 93.31%. Comparing base (527d55b) to head (3d1adb8).
⚠️ Report is 2 commits behind head on dev.

Files with missing lines	Patch %	Lines
packages/fx-core/src/common/wrappedAxiosClient.ts	97.29%	0 Missing and 1 partial ⚠️

Additional details and impacted files

@@            Coverage Diff             @@
##              dev   #15785      +/-   ##
==========================================
+ Coverage   93.29%   93.31%   +0.01%     
==========================================
  Files         585      585              
  Lines       37006    37012       +6     
  Branches     6928     6934       +6     
==========================================
+ Hits        34526    34536      +10     
  Misses       1836     1836              
+ Partials      644      640       -4     

Files with missing lines	Coverage Δ
packages/fx-core/src/common/wrappedAxiosClient.ts	98.01% <97.29%> (+2.61%)	⬆️

... and 1 file with indirect coverage changes

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