Fix SPIRV-LLVM-Translator header file path in out-of-tree build

[wenju-he]

Changes:

• Upgrade Ubuntu version to 24.04
• Switch legacy 'apt-key add -' to /etc/apt/keyrings/llvm.gpg
• Prepend SPIRV-LLVM-Translator header file path with LLVMSPIRVLib

Resolves #646

[Copilot]

Pull request overview

This pull request fixes a build issue when using prebuilt LLVM and SPIRV-LLVM-Translator (out-of-tree build) by correcting header file include paths. The PR also modernizes the GitHub Actions workflows by upgrading to Ubuntu 24.04 and updating the deprecated apt key management approach.

Changes:

• Fixed SPIRV-LLVM-Translator header include paths in out-of-tree builds by adding LLVMSPIRVLib/ prefix when USE_PREBUILT_LLVM is defined
• Upgraded CI workflows from Ubuntu 22.04 to 24.04 for out-of-tree and CodeQL builds
• Modernized apt key management from deprecated apt-key add to /etc/apt/keyrings/llvm.gpg approach
• Fixed environment variable naming from spirv-translator-dir to spirv_translator_install_dir (using underscores instead of hyphens)

Reviewed changes

Copilot reviewed 4 out of 4 changed files in this pull request and generated no comments.

File	Description
options.h	Added conditional include for LLVMSPIRVOpts.h with LLVMSPIRVLib/ prefix when using prebuilt LLVM
options_compile.cpp	Added conditional include for LLVMSPIRVExtensions.inc with LLVMSPIRVLib/ prefix when using prebuilt LLVM
.github/workflows/on-push-verification-out-of-tree.yml	Updated to Ubuntu 24.04, modernized apt key management, and fixed environment variable naming
.github/workflows/codeql.yml	Updated to Ubuntu 24.04, modernized apt key management, and fixed environment variable naming

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