Eugene Burmako b8ae8e3fa1 (NFC) Prepare for migration from producing MHLO to producing StableHLO
This CL renames occurrences of "mhlo" in: 1) names, 2) tests, 3) prose in order
to prepare for the upcoming migration.

Unchanged occurrences:
  1) Public API that contains "mhlo", e.g. XlaLowering.mhlo and the "mhlo"
     argument value in Lowering.as_text and Lowering.compiler_ir.
  2) Documentation (changelog, JEPs, IR examples, etc).
  3) One rare situation where prose says "StableHLO" and "MHLO" in one sentence,
     so both are necessary to disambiguate.

PiperOrigin-RevId: 495771153
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