[ts-command-line] Remove deprecations and perform updates planned for the next major bump.

[iclanton]

Summary

This PR removes deprecated members and renames a few things that were slated for the next major bump.

Details

Removal of onDefineUnscopedParameters is required for the conversion to SWC (#5202).

onDefineScopedParameters may need to be removed too.

How it was tested

Built and ran tests.

Impacted documentation

API docs will need to be updated.

[alexvy86]

Hi @iclanton, @dmichon-msft . This seems to have introduced a regression when running without the --local flag. When the API report files aren't up to date, the process is logging warnings but then terminating successfully (exit code 0) when it used to produce a non-zero exit code before. Reproduces consistently (in the microsoft/Fluidframework repo) with 7.52.5 but not with 7.52.4.

[D4N14L]

@alexvy86 good catch! I've created a PR to address this: #5226