Replace blackListHeaders with excludeHeaders

[Chaho12]

Description

Use excludeHeaders instead as blacklist isn't recommended in software projects.

• https://trinodb.slack.com/archives/C059KUNPTSP/p1726201453473869

Additional context and related issues

Release notes

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* Replace `blackListHeaders` with `excludeHeaders` in the routing rule configuration

[mosabua]

Agreed .. this is a good change @Chaho12

[ebyhr]

• Use excludeHeaders instead of blackListHeaders

Thanks for writing a release note entry. I would recommend mentioning where the excludeHeaders is used, e.g. "Use Replace blackListHeaders with excludeHeaders in the routing rule configuration"

[ebyhr]

Left come comments which can be addressed in a follow-up PR.

[mosabua]

please rebase and address the few small comments @Chaho12 .. then we can merge

[ebyhr]

Use excludeHeaderList instead of blackListHeaders #470

Please update the PR title.