[MachineOutliner][NFC] Refactor (#105398)

This patch prepares the NFC groundwork for global outlining using
CGData, which will follow
https://github.com/llvm/llvm-project/pull/90074.

- The `MinRepeats` parameter is now explicitly passed to the
`getOutliningCandidateInfo` function, rather than relying on a default
value of 2. For local outlining, the minimum number of repetitions is
typically 2, but for the global outlining (mentioned above), we will
optimistically create a single `Candidate` for each `OutlinedFunction`
if stable hashes match a specific code sequence. This parameter is
adjusted accordingly in global outlining scenarios.
- I have also implemented `unique_ptr` for `OutlinedFunction` to ensure
safe and efficient memory management within `FunctionList`, avoiding
unnecessary implicit copies.

This depends on https://github.com/llvm/llvm-project/pull/101461.
This is a patch for
https://discourse.llvm.org/t/rfc-enhanced-machine-outliner-part-2-thinlto-nolto/78753.

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