[mono][infra] Remove Mono LLVMJIT builds

[matouskozak]

Mono no longer uses LLVM JIT backend and uses regular mini JIT instead.

The LLVMJIT jobs were completely removed from the runtime-llvm and runtime-official CI and refactored into regular Mono product builds for runtime.

Additionally, make AOT and fullAOT jobs Release only (both PR and rolling builds).

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[matouskozak]

/azp run runtime-llvm

[azure-pipelines]

Azure Pipelines successfully started running 1 pipeline(s).

[matouskozak]

/azp run runtime-llvm

[azure-pipelines]

Azure Pipelines successfully started running 1 pipeline(s).

[akoeplinger]

Are you going to work on removing LLVMJIT from the mono runtime too?

[matouskozak]

Are you going to work on removing LLVMJIT from the mono runtime too?

I wasn't planning to. I thought that @radekdoulik was trying to remove that as part of LLVM 19 bump #103585 ?

[akoeplinger]

Yeah it needed to be disabled in that PR but I think we could strip it out completely in a separate PR too.

[matouskozak]

/azp run runtime-llvm

[azure-pipelines]

Azure Pipelines successfully started running 1 pipeline(s).

[radekdoulik]

Are you going to work on removing LLVMJIT from the mono runtime too?

I wasn't planning to. I thought that @radekdoulik was trying to remove that as part of LLVM 19 bump #103585 ?

We are making the runtime build the LLVM JIT without errors in that PR so far. It removes existing optimizations, which used legacy pass manager.

Given that this configuration (LLVM/JIT) is not used anymore, we can probably just strip it as @akoeplinger says.