[http-client-python] Apply includeRootSlashOption to operation level

[Copilot]

@clientOption("includeRootSlash", ...) was only resolved from the client hierarchy. This change checks the operation/method level first, falling back to the client hierarchy when unset.

• Check getClientOptions(method, "includeRootSlash") before walking the client parent chain
• Operation-level setting overrides client-level setting; absence preserves existing fallback behavior

// Operation-level override
#suppress "@azure-tools/typespec-client-generator-core/client-option" "workaround"
@clientOption("includeRootSlash", false, "python")
op myOperation(): void;

Original prompt

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This section details on the original issue you should resolve

<issue_title>[http-client-python] Apply includeRootSlashOption to operation level</issue_title>
<issue_description>Currently, includeRootSlashOption is applied to client level, we want to also apply it to operation level, and operation level could override the client level setting.</issue_description>

Comments on the Issue (you are @copilot in this section)

• Fixes [http-client-python] Apply includeRootSlashOption to operation level #9928

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commit: 955645c

[azure-sdk]

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