DNS resolution happens before connection pool lookup

[yzfeng2020]

Motivation:
repro of #6444
Explain why you're making this change and what problem you're trying to solve.

Modifications:

• List the modifications you've made in detail.

Result:

• Closes #. (If this resolves the issue.)
• Describe the consequences that a user will face after this PR is merged.

[github-actions]

🔍 Build Scan® (commit: bb0a688)

Job name	Status	Build Scan®
build-ubicloud-standard-16-jdk-8	✅	https://ge.armeria.dev/s/co5vvijfhfh3k
build-ubicloud-standard-16-jdk-21-snapshot-blockhound	✅	https://ge.armeria.dev/s/zbbuy56bclifa
build-ubicloud-standard-16-jdk-17-min-java-17-coverage	✅	https://ge.armeria.dev/s/wn26zg4wpx7nu
build-ubicloud-standard-16-jdk-17-min-java-11	✅	https://ge.armeria.dev/s/sbikcx5lufmzs
build-ubicloud-standard-16-jdk-17-leak	✅	https://ge.armeria.dev/s/xco52wgrdgu4u
build-ubicloud-standard-16-jdk-11	✅	https://ge.armeria.dev/s/ndpi6rrkskyi2
build-macos-latest-jdk-21	✅	https://ge.armeria.dev/s/vesqbox22ecya

[codecov]

Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 74.11%. Comparing base (8150425) to head (bb0a688).
⚠️ Report is 231 commits behind head on main.

Additional details and impacted files

@@             Coverage Diff              @@
##               main    #6443      +/-   ##
============================================
- Coverage     74.46%   74.11%   -0.35%     
- Complexity    22234    23001     +767     
============================================
  Files          1963     2061      +98     
  Lines         82437    86135    +3698     
  Branches      10764    11312     +548     
============================================
+ Hits          61385    63841    +2456     
- Misses        15918    16879     +961     
- Partials       5134     5415     +281     

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