governance action: prefix stake-verification-key/stake-key arguments with --deposit-return

[smelc]

Changelog

- description: |
    governance actions: prefix `--stake-verification-key-*` and `--stake-key` arguments so that they are prefixed with `--deposit-return` now.
# uncomment types applicable to the change:
  type:
  # - feature        # introduces a new feature
  - breaking       # the API has changed in a breaking way
  # - compatible     # the API has changed but is non-breaking
  # - optimisation   # measurable performance improvements
  # - improvement    # QoL changes e.g. refactoring
  # - bugfix         # fixes a defect
  # - test           # fixes/modifies tests
  # - maintenance    # not directly related to the code
  # - release        # related to a new release preparation
  # - documentation  # change in code docs, haddocks...

Context

Fixes #422

How to trust this PR

• Only parsers within Options/Governance/Actions.hs are modified: we're not changing the behavior outside the governance action scope.

Checklist

• Commit sequence broadly makes sense and commits have useful messages
• New tests are added if needed and existing tests are updated. See Running tests for more details
• Self-reviewed the diff