Add context and/or a help link to "Environment not found" error

[aaronsteers]

We could create something like http://melta.no#environment-not-found when folks run into

• bug: Projects without environments nor default_environment see error where dev environment is not found #6677

We could also give hints such as using the --no-environment flag or running meltano environment add dev.

This could leverage the new MeltanoError class and practices.

[WillDaSilva]

@aaronsteers This may not be necessary after the following two PRs:

• fix: Make default default_environment null #6877
• fix: Ignore default environment for some commands #6862

The new error messages from #6862 are fairly clear, and #6877 will make it so that when the user does not have default_environment set in their meltano.yml, they won't be told that the dev environment (which they never made or asked for) cannot be found.

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