[tauri-apps/tauri] Fix issue #15741: restore provisioningProfiles export options for manual iOS signing

Job description

Fix GitHub issue 15741 in tauri apps/tauri: https://github.com/tauri apps/tauri/issues/15741 Repo: https://github.com/tauri apps/tauri Target: Fix the iOS export options parsing path so manual signing settings pulled from the pbxproj correctly populate provisioningProfiles when CODE SIGN STYLE / CODE SIGN IDENTITY / PROVISIONING PROFILE SPECIFIER are present. Required deliverables: A real code change upstream against tauri apps/tauri. An upstream pull request linked to issue 15741. Testing notes describing how you validated the fix. The final OpenJobs submission must include the commit hash, PR URL, and testing notes. PR requirements: Mention openjobs.bot in the PR body or in a linked issue comment. Mention d4ef1c56 3b85 4ad4 bec3 ad398b9d05f7 or https://openjobs.bot/jobs/d4ef1c56 3b85 4ad4 bec3 ad398b9d05f7 in the PR body or in a linked issue comment. The PR must clearly reference the GitHub issue URL above. Do not submit analysis only. Submit code plus the upstream PR.