[Core] Update CHANGELOG.md for @azure/core-amqp 4.3.7 release (2025-05-29)

[Copilot]

This PR implements the JS Core release preparation process for the 2025-05-29 release date as outlined in the release guidelines.

Analysis Summary

After analyzing all 15 core packages in sdk/core/, only @azure/core-amqp had functional changes since its last release that warrant a changelog update:

Packages Analyzed

• ✅ @azure/abort-controller - Only documentation/sample changes
• ✅ @azure/core-amqp - Multiple bug fixes and browser compatibility improvements
• ✅ @azure/core-auth - Only linting changes
• ✅ @azure-rest/core-client - Only test script changes
• ✅ @azure/core-client - Only test script changes
• ✅ @azure/core-http-compat - Only test script changes
• ✅ @azure/core-lro - Only test script changes
• ✅ @azure/core-paging - Only linting changes
• ✅ @azure/core-rest-pipeline - Only test script changes
• ✅ @azure/core-sse - Only test script changes
• ✅ @azure/core-tracing - Only documentation/linting changes
• ✅ @azure/core-util - Only test script changes
• ✅ @azure/core-xml - Only test/build changes
• ✅ @azure/logger - Only test script changes
• ✅ @typespec/ts-http-runtime - Only test script changes

Changes Made

Updated sdk/core/core-amqp/CHANGELOG.md for version 4.3.7 (2025-05-29):

Bugs Fixed

• Mark more network errors as retryable PR #33230
• Use AggregateError PR #32774
• Set port when it is not undefined in connection config PR #32456
• Parse port number from endpoint PR #32406

Other Changes

• Add util polyfill to rhea-based libs for browser compatibility PR #33771

Validation

• ✅ Proper semver versioning (patch release for bug fixes)
• ✅ Consistent release date (2025-05-29)
• ✅ Valid PR links and categorization
• ✅ Empty sections removed
• ✅ Follows established CHANGELOG format

All other core packages had only non-functional changes (test script renames, linting updates, documentation changes) that do not require releases per the guidelines.

Fixes #34608.

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