Refactor vttablet Flags to Use Hyphen-Based Naming Convention

[anujagrawal699]

This issue is part of the uncompleted flag refactor project: Flag renaming: replace underscores with dashes #17880. Vitess is moving toward standardizing all CLI flags to use hyphen (-) instead of underscore (_) delimiters.

All the required binary changes are mentioned in #17880, but only changes for vtctld seem to have been made with respect to ticket Refactor vtctld Flags to Use Hyphen-Based Naming Convention #18021. Considering the v25 launch factor as mentioned in #17880, this needs to be completed.

This effort was previously part of an LFX Mentorship project (#17687) but appears to be incomplete for all other binaries apart from vtctld. This issue tracks the required migration for vttablet binary.

Related References

• Parent Issue: #17880
• Tracking Issue for vtctld changes: Refactor vtctld Flags to Use Hyphen-Based Naming Convention #18021
• Related PRs:
  • Refactor vtctld flags to follow standard naming convention #18294
  • [#17975](Standardize topo flags to use hyphen-based naming #17975)
  • [#18009](Refactor grpc flags for standardized naming  #18009)
  • [#17964](Refactor vstream_dynamic_packet_size and vstream_packet_size flags to use dashes #17964
• Refactor Helpers: [go/vt/utils/flags.go](https://github.com/vitessio/vitess/blob/main/go/vt/utils/flags.go)

[anujagrawal699]

@rohit-nayak-ps I created this issue based on the context from the related tickets and code binaries. Please let me know if this needs to be worked on, and I'll be happy to pick it up.

cc: @mounicasruthi