ci: switch to conventionalcommits preset for semantic-release

[SamuelSSalazar]

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Description

• Switch @semantic-release/commit-analyzer and @semantic-release/release-notes-generator to use the conventionalcommits preset, enabling feat! notation for breaking changes
• Replace semantic-release dry-run version detection in prepare-release workflow with semantic-release --dry-run --verify-conditions false to avoid token requirements while correctly detecting versions
• Update changelog generation in prepare-release workflow to use conventionalcommits preset

Testing

npx semantic-release --dry-run --verify-conditions false --branches "ci/conventional-commits"

Checklist

• I have added documentation for new/changed functionality in this PR or in auth0.com/docs
• All active GitHub checks for tests, formatting, and security are passing
• The correct base branch is being used, if not the default branch