chore(commands): Internal command naming could be more consistent

[catull]

OS?

Concerns code style.

Versions.

All versions.

Repro steps.

Not a run-time issue.

The log given by the failure.

Not a run-time issue.

Mention any other details that might be useful.

I'd like to suggest to rename two commands internally:
githubPagesDeployCommand -> GithubPagesDeployCommand
NgCliTestCommand -> TestCommand

I have prepared a PR that does exactly that: #4157

[catull]

PR #4157 was accepted, which makes this issue resolved.

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