OpenAPI 3.x Go generation's weirdness for enum names

[longquanzheng]

Currently, the enum names will be stripped the common prefixes.
If

        - FORCE_COMPLETE_ON_INTERNAL_CHANNEL_EMPTY
        - FORCE_COMPLETE_ON_SIGNAL_CHANNEL_EMPTY

Then the enum names are:

INTERNAL_CHANNEL_EMPTY
SIGNAL_CHANNEL_EMPTY

However, if

        - FORCE_COMPLETE_ON_INTERNAL_CHANNEL_EMPTY
        - FORCE_COMPLETE_ON_SIGNAL_CHANNEL_EMPTY
        - GRACEFUL_COMPLETE_ON_ALL_CHANNELS_EMPTY

Then the enum names are

FORCE_COMPLETE_ON_INTERNAL_CHANNEL_EMPTY
FORCE_COMPLETE_ON_SIGNAL_CHANNEL_EMPTY
GRACEFUL_COMPLETE_ON_ALL_CHANNELS_EMPTY

Because they don't have the shared common prefix anymore. The generator is "trying to be smart" but it's a terrible idea to do this without any parameter to control.
This would be a problem because the enum names are unstable as adding different values.
It will be nice to somehow get rid of this "smart stripping"...

A workaround today is to use "enumClassPrefix=true" however, this is also a breaking change to all enum names, and also the enum names will be quite ugly...

Reported in OpenAPITools/openapi-generator#16002

As a workaround today, make sure to have at least a letter different in all the enums from beginning...