Use normalized key when building getMap error message in DefaultConfigProperties

[thswlsqls]

Fixes #8642

Description

• DefaultConfigProperties.getMap(String) printed Invalid map property: <name>=null when the name needed normalization (hyphens or upper case), because the error message looked the value up with config.get(name) while config keys are stored under ConfigUtil.normalizePropertyKey(name).
• Change the message lookup to config.get(ConfigUtil.normalizePropertyKey(name)), matching the normalized-key lookup getList already uses (line 191).
• Internal method body only: no signature, return value, or public API change.

Testing done

• Added ConfigPropertiesTest#invalidMapWithHyphenatedName: a malformed map value under a hyphenated name (test-map = a=1,b) now reports Invalid map property: test-map=a=1,b; before the fix it reported test-map=null (verified failing before, passing after).
• Existing invalidMap (name map) still passes — normalization is idempotent for already-normalized names.
• ./gradlew :sdk-extensions:autoconfigure-spi:check — passed; ConfigPropertiesTest 17 tests passed. jApiCmp unchanged (internal method body only), no apidiff to commit.

[opentelemetry-pr-dashboard]

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Status last refreshed: 2026-07-20 21:23:40 UTC.

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[codecov]

Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 91.64%. Comparing base (09d6c17) to head (1cbf7bc).

Additional details and impacted files

@@            Coverage Diff            @@
##               main    #8643   +/-   ##
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  Coverage     91.64%   91.64%           
  Complexity    10348    10348           
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  Files          1013     1013           
  Lines         27380    27380           
  Branches       3218     3218           
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  Hits          25092    25092           
  Misses         1558     1558           
  Partials        730      730           

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