Rename assets list-by-alias to list-aliases in airflowctl

[justinpakzad]

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While working on another PR I noticed that the current command in airflowctl to list asset aliases was called list-by-alias. This is a bit misleading as it's not actually listing assets by aliases (there is an existing command get-by-alias for that) but listing all asset aliases. I have updated the command to be list-aliases which in my opinion is more aligned with what the command is actually doing. I updated the existing method, unit test, help_text, and value in the exclude commands list to reflect the new name. The behavior of the command itself was not altered, so there was no additional tests added.

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