[Console] Tiny PR to update the CLI help strings for the command groups

[mikaylathompson]

Description

Now you get to see all this helpful information:

root@aeda38bdc57b:~# console --help
Usage: console [OPTIONS] COMMAND [ARGS]...

Options:
  --config-file TEXT  Path to config file
  --json
  -v, --verbose       Verbosity level. Default is warn, -v is info, -vv is
                      debug.
  --help              Show this message and exit.

Commands:
  backfill    Commands related to controlling the configured backfill...
  clusters    Commands to interact with source and target clusters
  completion  Generate shell completion script and instructions for setup.
  metadata    Commands related to migrating metadata to the target cluster.
  metrics     Commands related to checking metrics emitted by the capture...
  replay      Commands related to controlling the replayer.
  snapshot    Commands to create and check status of snapshots of the...

Also I discovered some zombie replayer commands that are now deleted.

Issues Resolved

n/a

Testing

Check List

• New functionality includes testing
  • All tests pass, including unit test, integration test and doctest
• New functionality has been documented
• Commits are signed per the DCO using --signoff

By submitting this pull request, I confirm that my contribution is made under the terms of the Apache 2.0 license.
For more information on following Developer Certificate of Origin and signing off your commits, please check here.

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 68.70%. Comparing base (a978c0a) to head (4616333).
Report is 2 commits behind head on main.

Additional details and impacted files

@@             Coverage Diff              @@
##               main     #774      +/-   ##
============================================
+ Coverage     68.51%   68.70%   +0.18%     
+ Complexity     1578     1577       -1     
============================================
  Files           275      275              
  Lines         11596    11633      +37     
  Branches        735      734       -1     
============================================
+ Hits           7945     7992      +47     
+ Misses         3248     3235      -13     
- Partials        403      406       +3     

Flag	Coverage Δ
gradle-test	61.41% <ø> (+0.06%)	⬆️
python-test	87.62% <100.00%> (+0.24%)	⬆️

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