fix(aws-lambda): Fix query string handling for v1

[Holi0317]

The author should do the following, if applicable

• Add tests
• Run tests
• bun run format:fix && bun run lint:fix to format the code
• Add TSDoc/JSDoc to document the code

---

Fix handling of multi-value query string on API Gateway v1 event.

Similar to #2782, but for API Gateway v1 event.

API Gateway v2 already handles this case because v2 event uses the raw query string directly.

hono/src/adapter/aws-lambda/handler.ts

Line 285 in 190e122

return event.rawQueryString

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 91.70%. Comparing base (190e122) to head (1c1372f).
Report is 1 commits behind head on main.

Additional details and impacted files

@@           Coverage Diff           @@
##             main    #3717   +/-   ##
=======================================
  Coverage   91.70%   91.70%           
=======================================
  Files         159      159           
  Lines       10158    10165    +7     
  Branches     2855     2878   +23     
=======================================
+ Hits         9315     9322    +7     
  Misses        842      842           
  Partials        1        1           

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[exoego]

LGTM

[yusukebe]

LGTM!

[yusukebe]

Hi @Holi0317

Thank you for the PR. I'll merge this into the main now.