[cmake] Introduce LLVM_DISABLE_PROJECTS to easily exclude projects

[hamidelmaazouz]

Introduces LLVM_DISABLE_PROJECTS to easily exclude projects from the build as described in
#141502

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[hamidelmaazouz]

Hi @EugeneZelenko,

Could you help me review this PR or find the right reviewers ?

Best,

[EugeneZelenko]

Hi @EugeneZelenko,

Could you help me review this PR or find the right reviewers ?

Best,

It'll be better to look on file/directory history to find reviewers who are still active.