feat: commercetools-aligned per-method retry defaults for mutations

[machnicki]

POST/PATCH/DELETE mutations are no longer retried on ECONNABORTED/ETIMEDOUT or 500 by default — commercetools may have already processed the mutation server-side. Gateway errors (502/503/504) are still retried as the LB rejected the request before forwarding to commercetools.

Changes:

• types.ts: add MethodRetryPolicy interface and methodPolicies to CommercetoolsRetryConfig
• is-retryable-error.ts: method-aware logic with commercetools-aligned per-method defaults
• request.ts: pass httpMethod and methodPolicies to isRetryableError
• tests: full coverage of new method-aware behavior and backward-compat cases

[codecov]

Codecov Report

❌ Patch coverage is 94.11765% with 1 line in your changes missing coverage. Please review.
✅ Project coverage is 99.25%. Comparing base (9980e9d) to head (89d0ef8).
⚠️ Report is 1 commits behind head on main.

Files with missing lines	Patch %	Lines
src/lib/request/request.ts	50.00%	0 Missing and 1 partial ⚠️

❌ Your patch check has failed because the patch coverage (94.11%) is below the target coverage (99.00%). You can increase the patch coverage or adjust the target coverage.

Additional details and impacted files

@@            Coverage Diff             @@
##             main     #325      +/-   ##
==========================================
- Coverage   99.31%   99.25%   -0.07%     
==========================================
  Files          58       58              
  Lines        1456     1470      +14     
  Branches      148      156       +8     
==========================================
+ Hits         1446     1459      +13     
  Misses          2        2              
- Partials        8        9       +1     

Files with missing lines	Coverage Δ
src/lib/request/is-retryable-error.ts	100.00% <100.00%> (ø)
src/lib/request/request.ts	98.85% <50.00%> (-1.15%)	⬇️

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[github-actions]

🎉 This PR is included in version 6.28.0 🎉

The release is available on:

• npm package (@latest dist-tag)
• GitHub release

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